Im that fan that just out grew it. Once competition died, then the scene slowly dies, and now we got this new age stuff, and imo, the fans expectations are alot lower these days.
We would have laughed back in the day if a fighter got a bjj blackbelt in 4 years. Bj penn atleast proved he was worthy. These new guys just dont have that world class to their grappling anymore. Very rarely you get a high level wrestler anymore, when back then, they were too common.
I cant pin point the exact thing, cause i think its multiple. But the sport is just not as fun anymore