As long as Vlad stays healthy, he will beat everyone...................Joshua was out boxed by Camerelle for the gold, but home town criminal judges gave the fight to Joshua by split decision...................
Wlad will be retired by then. Povetkin might be old when he fights Joshua.. but I still wouldn't say he'll be washed up. Athletes get better with time, not worse. They might slow down, but they have the intelligence from all the experience.
Povetkins style of fighting though is dependent on his physical abilities, an old Povetkin wont be able to execute his style on his opponents as easily anymore.