Wouldn't making the concert a VR experience, using good MMD models, and making appropriate stages that take advantage of the main 360 camera placement do the same? Only issue then is just animation.
I think the Hatsune Miku as vtuber thing has been done. Not really sure if I like it or not though.
@Cacona That would be pretty cool, not just for Hatsune Miku and Vocaloid but also vtubers concert in general. Some can't just spend the money and time and effort to visit Japan every time an event happen after all, and it's not like they themselves receive any money from the plane's ticket