I'm in the same boat. I've also followed MMA since 2003 (before that just an event/fight here and there that I could download via Direct Connect) and in the last ~3 years, my interest has dropped significantly. It all started with some truly terrible fight card in Singapore (I think?) that only had b level Asian talent as main event. That's the first event I skipped, since then it has been many. Back then MMA/UFC was still good though, but now we have more terrible divisions with mediocre talent and too many WMMA fights on the main card. I'm all for WMMA, but I don't really care for some random chick fighting another random chick ranked #5 and they both are terrible. Same with men's MMA, just so many filler fights/cards that are pointless and it's impossible to keep track of all the "prospects".
Only watching big fights nowadays and skipp or fastforward through the terrible/irrelevant/filler fights. I would prefer the UFC building stars instead of a steady stream of lukewarm events.