I think Wilder will not take up the rematch clause because he needs time to recover from the physical beating and the mental stress, it should pave the way for the Fury-Joshua fight to get the go-ahead
What a great day for British boxing... all 4 of the heavyweight titles are held by British fighters

If the Fury-Joshua fight goes ahead then one of them will hold all the belts and will become the undisputed heavyweight champion. Well done to the Brits!
That's possible but if the fight will push through I'm definite that Fury can easily take Joshua but there is a rematch clause and Wilder wants a rematch and so we are going to see a third match I don't know how they are going to hype the third fight when one fighter totally dominated the other fighter, it will be hard to sell the next fight.