I will certainly agree that Carnival has gone down in some areas, including what they charge me for a cruise.
I am paying significantly less for most of my sailings than when I started with them over 15 years ago. Now, if their prices go up significantly, especially if other cruise lines' don't, I might rethink my decision to continue to sail with them. As it stands, Carnival is the best vacation bargain around. On a per-night basis, I can't even rent a crappy motel room for what I am paying Carnival for a nice cabin, not to mention good food, decent entertainment, and transportation to beautiful ports and beaches.