John Cena tapped out to two great competitors and submission wrestlers named Kurt Angle and Chris Benoit. Is Daniel Bryan a submission specialist? Yes. Is John Cena going to tap out? No. John Cena strives on the motto 'never give up' which means don't give up - I think this pretty much means not submitting as that's giving up. I can see Daniel Bryan winning, defiantly, but as far as John Cena tapping out seems to be near impossible.
I understand WWE's reasons for not making John Cena tap and that's completely understandable. If John Cena didn't tap out to someone such as CM Punk earlier in their long rivalry then I don't think they'll make Daniel Bryan defeat John Cena with a submission maneuver. It'll make more sense for the Bella's to interfere, thus extending their feud and involving them within the feud, but I'd like them to be as far away from the feud as possible, but it links in.