I pretty much agree with everything Tuco and Uncle Lester have said, er, written.
To me, our current 'origin' guys could perfectly function as they do now - as damn companions. And it's already been pointed out what a huge waste of resources it is to write, record and code every single permutation for every single origin-would-be-protagonist. Add to that we don't even have all the origins in yet. Also, some of you said that creating your own character for newcomers to D&D might be challenging, if not outright off-putting and how it couldn't be done in original BG games.
Yet not a single one of these characters was an origin a'la Larian creations. They are just templates for you to pick from if you can't be arsed to come up with your own. I don't think anyone would complain if Larian gave us a bunch of templates to pick from, who would have pretty much the same beginning as any custom. And leave our current origins as extra fleshed out companions. And I'm sorry if my entire post is oozing hostility towards origin characters, I hated the concept in DOS2, and I hate them in BG3 as well. I want, like so many of you, to create my own character and their backstory, I don't want to play someone else's character, it's actually one of the reasons I haven't played the Witcher series as of yet (even though I own them all - got them gifted to me actually). I've read the books though, being Polish and all, it's a rite of 'passage'.
Good point about the templates - I think it would be a good idea to add them regardless of origins.
As for The Witcher games - I'd encourage you to give them a try. I did a Witcher marathon (books+games) a couple of months ago and I have to say that I think the games actually have better story. (TW3 suffers a bit from being open world, and I personally didn't like the later acts that much, but it's still not bad). I can't say whether you'll have a similar opinion, but imo it's at least worth a try.