Serious reply to a joke thread but to me, the UFC started going downhill in the summer of 2010 when BJ Penn/Edgar and Shogun/Machida had immediate rematches.
While I actually felt the Shogun fight was the level of robbery to warrant the rare exception of there being an immediate rematch (considering there was a real lack of viable title contenders anyway), it set a bad precedent which has plagued the sport for the last 13 years.
Rich Franklin, Matt Hughes, GSP, Randy Couture, even Chuck Liddell.... none of these big name champions got immediate rematches when they lost their titles and their "comeback" fights provided great storylines that helped sell new match-ups while also building up anticipation towards an eventual rematch down the line.
Now big time upsets don't even feel special because you know the UFC is just going to run it back again right after and fans are subjected to the same damn marketing campaign again.
Not only that but the new champion either 1) looks worse against the same opponent lessening their hype, 2) loses the title back forcing a "trilogy" which clogs up the division, or 3) the ex champion loses 2 fights in a row unnecessarily hurting their credibility and possibly even forcing them to change weight classes. Literally no one wins from immediate rematches.
The oversaturated cards (sometimes 3 shit fight nights in 1 weekend), installing a ranking system, the Reebok deal, live bet odds, and "money fight" era have all been hard things to sit through but for me, the downturn all started when the UFC got lazy with their matchmaking and decided to just grind divisions to a halt with immediate rematches.
The reigns of Frankie Edgar (3 opponents in 6 fights), Cain Velasquez (2 opponents in 5 fights), Stipe (2 opponents in 5 fights), Usman (1 non-rematched opponent in 7 title fights), etc all heavily contributed to the entitled rank squatting wasteland we see in modern day where virtually nothing is special or anticipated. It's a damn shame.
TL/DR: Immediate rematches are shit and sparked the downfall of the UFC