We are never going to get a fully voiced MC.
Not in a game where "MC" could have as a bare minimum 8-10 different voices (all the "Origin" voices plus custom ones only for the player on top)
Which does sound unlikely, but I don't discount anything as impossible anymore.
I do think that during early Q&A Larian said something that could suggest them trying to do full VO, including protagonist. But I also remember it was vague enough that I didn't treat it as confirmation.
Full VO does make sense, especially from COOP perspective. I also think it makes more sense to voice Origins, that are already heavily predefined but not custom character.
As I am playing Inquisition right now, I have been thinking of this in BG3. Naturally, I don't really like it. First of all, there is no voice that would fit my Quanari, and the character voiced is bland as hell - because he has to be. Either created defined character (Shepard, Geralt) or don't. Going half-way just doesn't cut it.
I liked fully voiced MC... Until I created my evil Drow sorcerer and none of the voices worked at all.
I would definitely take more voice options, over fewer but full VO options.
I just beg Larian to do something about the "funny mime syndrome" with the camera lingering over our MC OVERACTING his reactions like a moron.
Either I got used to, or it got better since EA. But especially when I did a run with Gythianky the mime factor was hilariously off the mark.