I mean, it could be done. FF14 does it and is very popular. They have cinematic scenes. Their characters mouths move. Some are voice acted but most are not.
The problem is fans. Would fans of BG1 and 2 like seeing Minsc's mouth moving close up without voice acting in many scenes?
Let me say it this way. If touching the classics remakes has to be half-assed then it misses the point.