For me it started during the film-to-digita transition of the late 90's. Once '99 or '00 rolled around, presentation quality tanked, and badly.
By 2005 I had made my own home theater, which I still have. The presentation is cinematic in picture and sound and proportion. The only thing missing is crowd reaction, overpriced concessions and all that.
I still went to the movies 'til maybe.. 2013? Whenever Rush came out. That was my last.
One of the last film movies I saw was Brave the year before, at a local dollar place. When I was leaving, I saw a very young booth monkey moving a complete platter from one room to another, with no clamps. You understand, a platter is the entire feature + policy bumpers, trailers, etc all spliced together. 7+ reels. Heavy. No core. no support. No clamps. This is like a film Slinky just waiting to unravel. It's a mess of celluloid about five feet in diameter with a big hole in the midddle. He had it slung over his shoulder like Chewbacca's bandolier.
He was dragging the end of the film on the floor. No fucks to give. This is why your film had pops and scratches and lines in the late 90's.
Wasn't always like that. Here I go with the 'old man' routine: When I was a kid, like for Star Wars, around that era, top-shelf movie houses had uniformed ushers. Curtains. No ads before the show. Yes, there were ads during the show, like before the newsreel. But in between shows, the curtains were drawn, th screen hidden from view. It was a magical atmosphere.
Projection was crisp, the film clean and usually devoid of defects.
Now.. now it's "whatever, man. I just get paid to babysit the machine."
And on the film-maker's side.. well. That's another reason to stay home. A lot of bad film being made now, more than before, I think.
Now.. why should I patronize shoddy moviehouses and consume bad content, when I have better at home? And now with added internet I can get any film pretty much that I want, when I want it, legit or seven seas.
Hollyweird is dead, but no one's told the corpse yet.