Why do you think Allurance is gonna be end game? I'm just curious.

Though you would better ask an Allurance shipper, I’m sure they have all the screenshots and meta ^^” I suppose I may at least try to explain why I keep saying I’m 100% sure they’re endgame. And as usual, I’m sorry in advance for any mistakes as I’m not a native English speaker, and for this big mess of a post, if I try to make a better structured one I’d never finish it...

So, short answer is: tropes? When you get used to see movies/shows/cartoons and reading books, you can tell? Idk but it just seems very obvious to me. And I’m saying that when I’ve thought from day 1 that Allura deserved better, so I’m pretty sure I’m objective enough here, and well at least now I’m more okay with it because the development I knew they were going to give to Lance was actually - waaaay - better brought than most stories with the same kind of situation (awesome girl ending up with the straight big flirt ‘loser’ kinda situation). But I’m digressing.

So like, when this happen with a boy and a girl at the second of their meeting:

usually you can bet they’re endgame. It’s a common trope (literally called “Falling into his Arms” it was so ridiculously an obvious “hey look, these are the two straits you should be rooting for”, I rolled my eyes super hard at that, good thing Allura is not the passive kind of princess, her next reactions were fun).

I’m pretty sure you could check a lot of the common straight pairings love tropes for those two. The biggest one being The Lady and her Knight.

They are also colour coded in their paladin armour. Red and Blue are the rivals (no offence to KL shippers, even if in this case it was a mostly one-sided rivalery), but Blue and Pink, that's a hint especially in a cartoon, it's the most obvious you can come with for children because of our societies gender roles to tell them 'this is a boy this is a girl and they're gonna get married', I guess?

Lance’s character development began after he became Red’s pilot, but it was especially increasing in parallel to Allura and Lotor’s relationship: he is Allura’s love interest and his acting all jealous was something you found regularly in stories too, and then realizing in s6 that the reason she could never take him seriously was his own fault - as he wasn’t respectful to her, was even basically sexually harassing her - and from there on it was very obvious he is to become a more serious and responsible person, the kind of person she could be interested in ; it was all done on purpose presenting their relationship as a slow burn (there is a lot of slow burn pay off in this series imo, which what Josh Hamilton was talking about, and it’s not just about romantic relationships).

Also the fact that she didn’t seem to find it repulsive and ridiculous when the mice told her that he was in love with her, is a big good point for him: she would not have reacted with just a bit of surprise and a smile before, she got the time to become at least friend with him since they met, and she could see that he wasn’t just some rude idiot, that he was smarter than he seemed and that he had potential not just of greatness (which he already proved as a paladin) but also of nobility of heart, by sacrificing himself for her in 6x01 and by having his bayard turn into the same Altean sword King Alfor was using, very symbolic:

(also side note, Lance was the only one to get a glimps of ghost Alfor without counting Allura, when the ship and his IA got infected that time in s1).

His love and the importance he accords to his big family is something I can see playing a role in the development of their relationship too. Not only as making Allura feel welcome with them on Earth maybe, but also to show that he would make a good consort, one who would have the same sense of responsability and care toward a whole people, something the last Altean will need from Allura and anyone she would choose to share her life with. The ruler of a people (Allura) would need someone who seeks stability (Lance the family guy) rather than someone who wants adventures (or universe domination).

Which also brings the fact that the way Lotor treated Allura, then the way he treated the other Altean, was, is and will be opposed to how Lance is with her, classic love triangle (hey kinda like how they opposed Adam’s reaction to Shiro’s choice, to Keith’s unconditional love for him...).

And talking about Sheith, Allurance is also the only other relationship that has symbolic and or meaningful/deep moments at least once per season if not more (again, lots of tropes in those scenes).

I've seen people calling Lance "the rebound" which I find super weird, I personally see Lotor being the bad experience, but experience nonetheless, she’ll know better now than to give her heart to the first charming dude I suppose, and Lance the better choice now that he realized the difference between a crush and real love and that women deserve to be treated respectfully, and not just as sexy things, and that he could at least offer sincere and unconditional support if he really loves her.

I’m sure there are other things we could add, really there must be some good long meta out there, I’m just gonna finish here by saying that Voltron is indeed a cartoon about a group of hero forming a giant robot to defend the universe, but their relationships (all kind, friendship, family and romantic) all play a big role in their development - especially because they are young people. Which then plays a big role in their confidence about their abilities, their will to fight for what they believe in and what they want to protect, their bond with their lions and Voltron’s strength itself. It’s also a cartoon for teens rather than little children (like idk, Pokémon), so I do believe that at least one main pairing will be explicitely canon endgame, and the most logical would be the straight obvious one Allurance (and if they have the guts to defy the dudebro fanboys, at least subtily, Sheith). It would be appropriate to finish such a story with a hopeful joyous note, with super friendships between not just the paladins but also different species accross the universe, families reunited, and new families being formed.