I agree that years ago the Celebrity product (and other cruiselines' products, as well) was different than it is today. Celebrity did cater to a more upscale clientele, but so, also, did most of the other cruiselines. Why? Because cruising was relatively expensive and the only folks who could afford to cruise were those in the higher socio-economic brackets. Cruising was an "elite" vacation, reserved for the very few.
Some twenty years ago, the cruise industry came to the realization that there was an enormous untapped market in the millions of people who had never cruised, and began seeking out those people. Since then massive ad campaigns, lower prices and (until recently) a strong economy resulted in millions of new passengers, many of whom would never have dreamed of taking a cruise just a decade ago.
The result - the cruise product has changed over the years, but so, too, have the passengers, and unless the cruiselines begin requesting tax returns prior to accepting reservations, that's the way it's going to be.
That being a given, I still believe the Celebrity product is several notches above the rest of the mainstream cruise products out there.