I was going to say "it not deteriorating, it's just..." and then I realized that it IS deteriorating. We can discuss how's and why's, and we may or may not come to an understanding why, but the fact is, it is.
I grew up watching baseball, football, and hockey. Baseball was ALWAYS on (we got the Yanks on Channel 11, WPIX, and the Mets on Channel 9, WOR), football you had to wait until Sunday - always the 1:00 game, sometimes the 4:00 game - then Monday, but it was only those two or three games, tops. Hockey you had to wait until the playoffs. I've soured on baseball in the last couple years; I think the steroid thing ruined it, and the $750 million contracts didn't help. There just aren't enough guys like Paul Molitor, or Paul O'Neill (REALLY good players who weren't attention whores like Barry Bonds and Sam Sosa). It's hard to relate to now. Hockey is still good, but there are too many teams, and I lament the movement south of the border.
Football was the last bastion; I enjoy/enjoyed the Thursday games, I enjoy/enjoyed the Sunday night games, but it's fast turning into the NBA. I don't watch football to watch assholes strutting and signaling their first downs, or miming after touchdowns, and the de-evolution of some teams into one-man shows is boring to me. I'm not on the Mahomes/Jackson bandwagon. I'd much rather see the coordinated, systemic execution of 11 guys moving the football down the field than watching watching one guy run around like it's a game of cream the carrier, then heave it 40 yards to a guy that's barely open, then get the flag because the defensive back touched the receivers (penile) helmet by accident.
I'll still watch, but as the current wave of players/coaches goes by the wayside, I can see my interest diminishing if something isn't done. I'll watch Belichick, Brady, Tomlin, Roethlisberger, Harbaugh, but if the next wave is a Mahomes, Beckham Jr., Brown, Gase, Kitchener WWF event, I'm probably out. I'll go back to hockey.