I personally think that Wilder has lost the desire to fight. Yeah he got beat up and humiliated but he could have easily bounced back from this, easily.
All he had to do was gracefully accept his defeat, change his trainer and get back in the gym. Let Fury and AJ have the undisputed fight and take on tune up fight with either Dillian Whyte or Povetkin - Wilder beats both these guys IMO, gets a decent name on his resume and a healthy pay cheque as well. He then puts himself in a position to face the winner of AJ/Fury in another undisputed bout - with a punchers chance he could win that fight and be top of the division.
For me that would have been the most logical way to go about things - but how he's gone about things suggests to me he just doesn't wanna fight anymore. Even if you're a Wilder stan you really have to question who he has around him because this is quite frankly the worst handling of a loss Ive ever seen in sports, never mind boxing.