Introducing live speech/vr into RP sounds incredibly awkward, especially if your voice doesn't, uh, fit your character. Also it makes it kinda tricky to do awesome combat poses or describing things happening. That stuff's fine for tabletop games, but the average 'run plots and RP isolated scenes' superhero mush would be weeeeiiiirrrd.
Really I think we just need A) A new thing that lets us more or less what we do on MUs, but with better/more convenient functionality, and B) find some way for people to actually find out about that thing when/if it exists.