Really the OP is so biased its makes taking any sense out of it difficult. If your going to bash a character at least pretend to look at a different angle …

Ace is luffys big brother who until recently had little to do with the plot. But right now he does , This whole battle is over him. Also if he dies we get a crewless emo for god knows how many chapters.

Ace could die , but he could also live. If ace dies many fan girls will cry, Many people in once piece will become bitter / relieved. If he lives though not much changes except we get Ace being depressive. Though his dream could shift to making luffy the pirate king ( most agree on WB dying right?). Personally i would like Ace to die saving luffy somehow or being left to a fate uncertain.

Also whom ever hates the key is acting stupid. Boa hancock gave luffy a key to A: create a false hope of luffy saving ace B: to make saving ace easier. Kubo has saved Ace twice , but that could also be him trying to lure us readers into a false sense of security. But some of the arguments here....get a grip there about hundred views on everything and until one becomes reality there all valid ( Sammy was just really arrogant every post which made any decent point he had kinda fail.)