I agree that it probably is a fold - but I think if you can get it all-in preflop you would actually be a favorite over every hand. The problem is that if you can't get all-in preflop you will have to play a big pot out of position with a hand that almost certainly won't flop well. So if you were in the late stages of a tournament and one of you was shortstacked, it would definitely make sense to try to get the stacks in and see what happens.