I think lots of peoples priorities changed the last few years. I considered giving up my tickets after being home for a year because my couch is pretty comfortable and I wanted to watch games with my son. My wife talked me out it luckily as there is now a wait list. But I could see people just wanting to spend their time/money on other things
Also, lots of Steelers hate Tomlin and feel like he should have been fired years ago
Spoiled fans