Here's my rambling theory:
Trump joined the campaign as a lark to get more attention for his TV show. He ended up winning despite outlandish statements.
Now that he's in the big chair, he can't handle the duties of the office. Too much stakeholder drama, satisfying rival factions, can't focus on his business, can't goof around like the good ol' days, etc. He can't have it his way all time, he's annoyed, irritated, frustrated. He won't up and quit because that a sad, sore, evil loser move.
The upside is a clearing of career politicians, more on the GOP side, but some Dems too. If the DOJ and FBI probes bring anything good, it'll strengthen the laws, and clean up the swamp as Trump wants.
If Hillary was elected, chances are slim that the DC corruption would have been exposed as it is under this administration. It'd be the same old, same old.
Change is good, even when bad.