Yes, these three young dual-threat, black quarterbacks have done well. But the problem with QBs that run so often is that they don’t hold up too well in the NFL. Donovan McNabb was once a frequent runner until he sustained season-ending injuries in three or four consecutive seasons.
RG3 was injured while running and missed a game a few weeks back. The question is still whether the running QB can last even a few seasons in the NFL before serious injuries diminish or end their ability to play the game.
And even with these three, all the coaches and knowledgeable observers want them to minimize the hits taken and to slide to avoid taking hits. I don’t think QBs who run frequently will have long careers in the NFL.
If Michael Vick is any indication, the answer is still no. Well, missing a couple of season due to incarceration doesn't help, either.