I'd go as far as saying that I wouldn't be surprised if Fury-Wilder 3 doesn't happen ever.
Fury is a loose cannon and there always seems to be some sort of drama in the lead up to his bigger fights. Is it doubt? Is it pressure of these fights that he doesn't really need and the hunger gone?
It has the hallmarks of a fight where Fury takes his eye off the ball or just disappears from the scene again for some time. With Fury nothing would surprise me.