If oda killed off ace but not people like pell ... or enel. I think i might just crap a scale replica of the Thousand Sunny because that would make no sense. However if by defeating him .. Black beard kills ace's dream of making whitebeard the Pirate king, That will mark the first time one of our "Hero's" for lack of a better term has thier dream crushed instead of a Villan.
Note: I'm not saying that whitebeard couldn't become pirate king with ace beaten just that it's ace's dream to make whitebeard pirate king and he would no longer be part of that.
I think thats highly improbable, there are two untouchables in one peices hero charracters, one is their lives two is their spirit for adventure, so I guess ace is still alive, eventhough hurt, but the important thing about ace's fight is the political side to it, oda made a note at the end of the chapter where ace and black beard went head on that that event was the beggining of more events to come, so like a chain reaction, my guess is, white beard saw that one of his commanders couldnt handle teach so he takes it on himself to teach teach a lesson, becuase whitebeards is really stubborn about this issue he will do whatever is needed and this time it seems that him taking teach on is whats needed, eventhough he is very proud this topic is very sensetive for him, and I think this is where he will fall, I think one of the four emperors gone is something with a major impact on the power balance of the world, and in the middle of all this teach wants luffy which will get the strawhats os this whole mess with the worlds most powerful men in the sea, where the showdown will be the new world.
just my thoughts and predictions, they dont have to be true.