Tbh I think a lot casual viewers / non book fans are probably going to not continue the show after s2 unless it diverges quite drastically on louis's storyline? iwtv is very bleak and I genuinely think they underestimated how much show viewers ended up hating lestat after s1 (and they may end up in a similar situation with armand in s2) and then you're asking the audience to watch an entire season of this guy's whole backstory. plus you're killing off one of the two likable characters by the end of s2 and shifting louis into more a side character.

a big red flag to me was the lady who hosts the podcast who doesn't have a book background saying a lot of the same stuff as show-only people. like she clearly does not like lestat or loustat at all lmao and its literally her job to promote the show.

First, I want to address the "shifting louis into more a side character" because no I don't agree with that. Contrary to fans believe, Hollywood-standard wise (from the number of episodes they are in, how integral their characters are to the story), both Jacob and Sam have been considered as lead actors/cast of IWTV. You can see industry news outlets calling them both as such. But because IWTV is about Louis' past specifically and AMC knew IWTV still has some hope in Emmys even though it's small, they put them in different categories to not split the votes between them (they even only submit one actor in each category for it). So, look at what we have now, Louis is the narrator yet we still get Lestat in all episodes, and he's leading the NOLA narrative forward together with Louis despite not existing in the Dubai narrative. I bet we'll still get Lestat in most, if not all episodes, in S2, because Rolin has said many many times, the show is about both of them. And I expect they'll do the same in TVL season(s); Lestat is telling the story while Louis is leading whatever will be going on in the modern time. (No, i don't believe they'll make Louis stuck on a couch the whole season to listen to Lestat's story even though it sounds tasty. He'd definitely have a way to know what Lestat's saying, but I don't see anything good writing-wise from sticking your well-developed character in one place for such a long time)

About whether the audience will be willing to listen to Lestat's past, I'll see how S2 goes first before judging that. A lot of people don't like him, but there are a lot of them who are like, "I will miss him if he dies, he's an interesting character".

And IWTV is a niche show, its genre is gothic horror/romance. Who the hell is doing gothic romance for a series in this decade? (Hannibal doesn't count, it's not gothic and still about will/won't they). Like, what AMC is doing with IWTV now is extremely daring. And with a niche show, it's always the same: you can't please everyone. There will always be part of the general audience who will leave because either it's simply not their cup of tea or they can't stomach it. Especially now when there's this purity sentiment going so strongly in general (apparently now we shouldn't ship fictional characters, every sex scene has to have a grand purpose, and you shouldn't watch any portrayal of abuse even though it's produced by the victim herself). God forbid IWTV would ever want to please those people yikes. So, IWTV won't ever get as "mainstream" as what, Succession, Ted Lasso, Better Call Saul. But IWTV would still appeal to people who appreciate good writing, people who are "idc how bad the characters are as long as they're exciting!", and people who really love horror (not that "comfort horror" BS) - there's this review of IWTV from an horror website who is like "I wish they gave us more gore and horror of vampires", oh these people would love S2.

So, tl;dr you could say it's a natural selection (hell yes Darwinism), it's inevitable. I'd rather have that audience leave than stay and ruin fans' experience by whining about the plot that won't ever satisfy them. And I'd always applaud writers who don't give a shit to what people say and stick to what they're meant to do. They slay!

EDIT: ah I forgot about this. but don't underestimate the number of old fans who will probably check the show again when the TVL season(s) come. Because no matter how big their hatred for AMC is, it will be the first time ever for TVL to be adapted on screen. First time in 38 years (yes no one considers QotD movie ever existed). That's too big a temptation!