I'm almost certain he'll take the rematch. Not only will he want the belt back but each fight in a trilogy always make more money with each fight. There's just more buzz and interest.
I'm sure there'll be interest and no doubt a boatload of money to be made but I can't see the interest being at a similar level. A third fight pops when the previous two left the questions unanswered.
Both this and Ruiz answered the question in the second event. In terms of actual narrative a third one would be pretty redundant.
Wilder has called for third rematch his team invoked it so we will have a third rematch coming, but this fight should have a hype because as you can see Wilder is badly beaten and totally outclassed, he will need to convinced the paying public that we will show a different stuff in their third meeting.