It's certainly the fight the boxing world wants from a crossover point of view. It would be a mega fight. I'm not sure either fighter should be looking beyond their next opponents though as neither fight is a 'gimme'.
I would day if it is the case then fair play to Joshua, he has previously said he wants to fight anyone to get his hands on the belt and he seems to be proving it's not just words. If the fight goes ahead his last 4 fights would read:
Takam (should have been Pulev)
With Pulevs injury and Fury being out the ring seemingly indefinitely you could only really sub in Povetkin to make that a tougher run of fights.