Yamamoto presumably is not down with collateral damage given that he sacrificed himself rather than seeing Wonderweiss blow up and kill everyone during the fake Karakura arc (even though it would have also killed Aizen). Since his sword is sucking all the water out of Soul Society, presumably if he waits too long, it'll set the whole place on fire, so he probably can't use it for long, drawn out battles. Now, whether that weakness ever matters depends on if he's ever met someone who can stand up to his power, but presumably if he did, his Bankai would have a time limit.
Also, really hoping this whole thing is not as predictable as we're all imagining it is going to be.. I really don't want the old man to lose his Bankai, I just wanna see him go to town on these guys with it >.>;
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