The only way I see him winning is by decision. I agree, I don't think he has the power to stop Wlad, nor that there will be enough of a round by round imbalance for him to wear Wlad down. I think the most likely result of this fight will be a Wlad ko, that Wlad's power, experience, and discipline is too great and Fury has real chin and discipline problems. If it somehow goes to the cards though, and if its not because Fury just feels Wlad's power and retreats into a shell to survive, I actually think Fury has a good chance based on his size advantage, workrate advantage, and speed. Fury will have to show much better chin and discipline than he's shown to this point. It would be an "Ali" moment, proving much better in those areas that shown to that point, as opposed to a "Grant" moment, validating the earlier questions about him.
He won't even be the best heavyweight challenger in A year... Klitschko just fought Pulev and Jennings. This is a step down in class.