Meh. I was pretty sure anyone above the skill of a VC could get a bankai or could achieve it, whether he/she can actually control it is another matter, I'm talking about just achieving it.
* Looks at Renji and Toushiro before this arc
So I guess it's just overrated, the bankai, because I always felt like it was actually something that a lot of strong people could achieve lol.
I hope he isn't the last boss. It would get so much attention and crap all over him that I wouldn't be able to handle and would just make me angry. xd