Speculating on what's next for Usyk, I've just read that the order of claims (order of which boxing organisations can demand Usyk to defend the title against a mandatory contender) is:
1 - WBO
2 - WBA
3 - WBC
4 - IBF
So there will be pressure on Usyk to either fight Parker or vacate the WBO belt, as I don't think the WBO would agree to defer it if Usyk decided to fight someone else.
Belts are one thing and money is another. In terms of profitability, Usyk has better-paying options than fighting Parker. Tyson Fury has already announced his willingness for a trilogy. AJ would be happy to do that too, and there's even an option for a freak-fight against Jake Paul, who somehow was allowed in the ring at Wembley after Usyk KO'd Dubois.
For now I don't see any boxer that can take on usyk paker is one boxer that we have seen but truth be told paker don't stand a chat against usyk whether compulsory match or not usyk is going to win I see usyk holding on to these titles for a long time with the current challengers that am seeing because they don't pose a threat to usyk at this very point in time