I may be in the minority here (or perhaps I'm just an old guy), but in the next version of the game we all love can we go back to the idea that clerics heal folks?
The healing surges/second wind mechanic from 4e felt very wrong to me. I know we are playing elves and wizards and such, but having a fighter "magically" heal himself didn't even make sense within the fantasy genre from which D&D was born. Having the clerics heal with spells just made more sense - they channeled the power of their gods and the gods granted healing.
We don't need to have every class be able to do the things other classes can. Niches are good. You don't spend your whole life studying the powers of the cosmos to become a mighty wizard and also be the master at the great sword. If you want to do both, you aren't going to be as good at either as someone who focused on only one.
Multiclassing is good. Sacrifices are good. But let's return to more logical things....please?