There's a very real chance that Fury will win and possibly stop Usyk. I guess the AJ fight makes sense at some stage regardless of outcome.
If Usyk knocks out Fury which I think he will he must fight Joshua next. Fury vs Joshua for the Battle of Britain and loser retires in disgrace.
This is the most likely scenario. But, judging off Fury's appearance at the Joshua fight, he's not gonna fight Usyk. I reckon he'll duck Usyk and hop straight into a fight now that he he knowns Joshua is shot too.
Win or lose in December, a fight with AJ would bring both men a lot of $$$ and then they could both retire.
Or he could lease premises in a big shopping centre and get into the scented candle business. Maybe offer unique floral arrangements for birthdays, anniversaries, etc in the same shop.
I don't see Fury settling for payday fights. Most likely retirement and rants about potential comeback from the rehab.