Given Astarion's popularity, I won't be surprised if we see a lot more bratty vampire party members in the coming years. While playable vampires has worked before BG3, I feel like there are too many narrative exceptions that need to be made for them to work; either the game has to be specifically about vampires, like the Masquerade games, or, as with Astarion, the writers have to come up with a workaround that allows them to operate in sunlight so they can be a part of the team. Both are fun once in a while, but they'll get old quick if they're overused.