Alice broke up with Bob. Bob grabs the YouTube videos from Alice and makes video and voice profiles. Bob then posts a video of Alice saying how breaking up was her biggest mistake and how she misses <list of every sexual thing you can think of> because Bob does it all best.
That could end badly really easily.
Because the market appears to have spoken on that one and it said "meh, I don't care" with an solid shrug of indifference.
By the same logic, one can see artificially produced vocal performance combined with artificial overlaying of photorealistic 3d reproduction as a way to cost effectively maximise the performer and crew expenses, and ensure the consistency of a performance. The results may even be better than what they could have done with the real performer in the case of some attractive actors who are not very good at the acting part of being an actor/modern celebrity.
That said, I'll definitely miss the days people had to actually be able to act, but then again I also miss the days people used to actually be able to play an instrument well and or sing well if they wanted to be a famous musician.
https://www.wired.com/video/2017/02/how-rogue-one-recreated-...