One theory I entertain is that all of this AI tech, starting with the deepfakes stuff, coming out so suddenly into the public over the past couple of years is meant to provide cover for inconvenient blackmail getting leaked to the public. It's a double-edged sword for the bad guys, because on one hand it protects the individuals in the short-term, but on the other hand it makes the value of blackmail less since it can be alleged to be fabricated. I suppose it depends on who controls the media as to what the public will accept as plausible in a given situation, but still.
Either way, the more advanced this technology becomes at simulating false realities, the more immersive and engaging vtuber content will evolve to be with less and less effort on the part of those producing it.