It's not like Mr T was Marlon Brando or Lawrence Olivier. He was a former bodyguard, IIRC. Hardly a greater acting background than being a UCF fighter.
BA is all about attitude, sass and physique. The current actor certainly has the latter and seems to have the other two. If he nails all of that, then he'll be a better Mr T than many a better actor might have made.
The thing about Mr. T, though, is that although he superficially acts like a mean, scary guy, you can tell that it's just a facade and he's really a teddy bear underneath. That's the secret to his charm. Even in the very first episode of the show, B.A. was shown acting as a mentor for a group of children.
Finding someone to play a tough guy is the easy part. Being an endearing, wholesome tough guy -- that's harder to pull off.