Hoboy... While I still harbor a huge mancrush for ol'Steve I.. actually do not want this to happen. Bucky as Cap has been growing on me rapidly and very strongly, Steve's return would completely screw up the character dynamics in his book, and quickly invalidate it alltogether. And Bucky hasn't even found his place in the Marvel U proper yet.
I just think that at this point, Steve Rogers works much better as a symbol.
Plus if he comes back, he'll either have to adhere to the new Status Quo or we'll have months upon months of Cap delivering accusing stares and longwinded speeches, until it finally leads to a big, teary-eyed grup-hugging reboot to Just How Everything Was. Both makes for the most insulting and the most boring comics imaginable.