It would be in such bad taste that even the American recording industry wouldn't go near it. People already get upset that they use old entire recordings to produce new songs, and those are actually his lyrics and his voice.
There was a small amount of outrage at the time of its release, but it mostly focused on the fact that those constructed lyrics were endorsing other rappers (mostly Eminem's protégés also performing on the track), whom some fans felt Tupac would not have endorsed had he been alive.
It's one thing to construct some ad-libs, but to actually create a piece of art (i.e. an entire verse) is a whole different ball game. It would be like if someone took fragments of Picasso paintings, constructed an entirely new painting, and called it a Picasso.
I suppose it's conceivable that someone might try to do it, and it's apparently technically possible, but I think it would be roundly rejected.
Oh, I'd take that bet. I would even bet that the producers will claim to have been in touch with his spirit.
What in hell makes you believes the recording industry has good taste?
Is bear-baiting coming back, then?