It's also aging. I'm older now, have a family and a career. I'm not hardcore anything anymore. I used to be a hardcore Feyenoord-supporter, MMA-fan, drinker, user of partydrugs, weed-smoker, party-goer, womanizer (often failing though) and all that shit.
Also, in general I'm less interested. The hero's I grew up with are now retired or are plain shit nowadays. After Spider, Overeem and Shogun retire there is no-one left.
It's hard to become so connected to the next generation of fighters. There is no nostalgia, you've seen it all before and you havent evolved togeather (as a fan and a fighter over the years).
Outside of the fact that it's a bit weird to idolise someone who's 10 years younger.
And to throw in a subjective fact as well: The new generation of fighters wine about money and money fights, talk about attendance and feel the need to smacktalk. That's not for me (even though amusing from time to time)
TLDR?? Fuck off then and grow an attention span