First of all, they've implemented all classes from the PHB. We have an abundance of choices by default already.
Also, that would require for Larian to get all the writers and voice actors back to create new lines for the new classes.
So nope, I dont think thats a good idea. You absolutely need more classes than that, well ask the modders for that.
I mean, if the modders cant do it, then we may need better moddability of the game, but I wouldnt know the first thing about that, never looked into it.
That is entirely in the cards, as there are plenty of hints at a DLC, which would require the actors to come back anyway. Heck, they've hinted at that themselves.
