Cinema revenue has been increasing because of the higher price point of 3D movies, and the general increase in ticket prices. Add the recent (very high) inflation to this, and you'll notice that all the numbers Hollywood accountants are bragging about are actually a solid indicator of the movie industry going south, fast.
Roger Ebert has been a staunch opponent of 3D, and while he's not the most important man in the industry, his word carries a lot of weight with much of the movie going audience. If such a prominent figure takes up arms against it you can bet that more people will do so, and soon. Add to that the recent reports of how the current implementation of 3D is actually harmful to the human eye and you've got an avalanche waiting to happen.
What's even more, independant movies are on the rise and studios with little to no input from their parent companies (like, for instance, Pixar) are proving to be much more succesful in the long run than any of the execs' own creations - They have been relying on licensed franchises for their money for a long time now, exceptions such as Inception or Avatar not withstanding. This only shows how desperate Hollywood has become.
Not to mention that the (video)games industry has overtaken Hollywood by a not-so-inconsiderable margin. It says a lot when your product is being outsold by a supposed children's toy to the same audience you're trying to sell your 'works of art' to.
Oh, and Farmville has been more profitable than Avatar.
Cinemas as they are now are on their way out. They will still exist, but in a far more specialized manner. They will get more expensive, but in return you'll get a better experience. They will get rarer, but the quality will go up.
That is, if the film industry finally realizes it's entered the new millenium over a decade ago and starts to reform it's business accordingly.