You don't need to be depressed to see a decline in the outside world. For people that are old enough, it is quite obvious.
But not finding joy in anything is an actual sign of depression. Have some media standards declined? Yes, definitely. But by no means is literally everything bad now. You can still find plenty of non-formulaic media on streaming services.
Moving to something else that provides joy is a sign of healthy life, not depression. If you don't like modern media, you don't have to find some that you like, you can look somewhere else, in a completely different area.