Aizen will use his secret attack "Kubo Troll" (
I kid, I kid, maybe).
That's one character Kubo seems to really dig and I have a hard time seeing him killing him off for good. It's possible that Aizen had plans against Juha Bach if this ever happened. I mean he was approached by him so it's quite possible that Aizen somehow added him into a fail safe plan if he lost against Ichigo (
which he did).
Kubo is actually doing some pretty good work so lets see if he can convincingly have Aizen trump (not necessarily defeat) Juha Bach for the time being.
Another interesting thing to note is the fact that Ginjou Kuugo's entire inferiority complex he had with the Shinigami sort of became relevant when Juha Bach is telling CC in his final moments of how foolish and arrogant his discrimination against humans was in the very end seeing as he was defeated by one. It really sank the entire ironic nature of the whole thing.