Is the traditional FPS really declining?

You play backwards, CS and then DOD and then AVA, and the difficulty increases. If you don't believe me, you will be surprised to see that you are ruthless, and then just go back and forth.

Expectations are too high, well, that's the main reason. Old birds are obviously not as happy as novices when playing games, and they are depressed against the wind. Maybe this is why people fall from the peak.