In general, I think that we are missing the boat on this thread....so to speak. I remember having a cabin so small that my roommates and I had to literally leave the cabin in rotation in order to get dressed. I remember another cruise where I was wishing for a jar of peanit butter because the food was so bad. Etc. So, while no doubt some things have gone downhill, many others have improved. For me, the biggest negative trend is the monster ships. Too many people in ports and just too big overall.
Also, our last 2 cruises, one on Carnival, one on NCL, the MDR food was so good that we never ate at the "pay extra" places at all.
Okay, call me Pollyanna, but I am happy with most of the changes so far.