I wasn't the biggest fan of his when he showed up, but I've been cool with Joe's winning streak.
I don't think he buried the X Division so much as he showed that there was a big gap in quality between the top of the division and the rest. His matches with AJ and Daniels just showed that those three were in a class of their own. That's not really a knock to the rest of the X Division, they definitely don't suck. They're just not as good as AJ, Daniels, and Joe. Try as I might, I just don't see anybody else in that division in their class. I do think Shelley could be the next one to get there.
In the heavyweight division, he hasn't lost, but he hasn't run through everybody either. There's still plenty that they can do there. My guess is that Sting will win the title at BFG and Joe will be the first challenger. Angle will be in the mix, Jarrett of course, and Steiner could always come back to be a thorn in Joe's side. I think there's plenty of options...