Saying he's on par with AJ Lee is an insult. Plus he's better than Punk at times.
And now, he doesn't NEED
1. They already have their own bully, just 10x less of a heat magnet and lacking of everything compared to him
(I do like Ryback, though)
2. He's in his 40s. RVD is in his 40s, but he's even about to have his contract expire.
The only way he'll ever be brought back into the WWE is with Devon to recreate the Dudleys, a tag team in which he's passed at this point.