Kinda sucks, he was a decent guy to have around and I don't think TNA did too badly with him, considering the year they just had. However, I think his X-Division run was promising at first but suffered from TNA not really giving the X-Division too much attention and by the time he finished up with The Revolution, he hadn't done anything after being champion. I think they could've used him more than a guy like Abyss in the group, but then again all of The Revolution could do with some better booking.
Hopefully he returns occasionally (and maybe cuts an English promo or two, that would be nice to see) for some X-Division matches, as far as X-Division guys who could be World Champions go, Sanada's great in the ring and is quite a nice size like Aries, so he could look quite credible - now I just wonder if Bram will join The Revolution, hopefully kicking out Abyss. Storm, Bram, Manik and Khoya would be good but if they left Khoya out to train and kept Sanada, it would be so much better.