I really don't see the point in suddenly inventing a word that there is no real need for, especially if no-one can then actually decide what the specific definition is anyway.
People have been eating cheese for hundreds (if not thousands) of years. Some people rarely eat it, some people regularly eat it and like to sample lots of exotic varieties, some people have never had any in their entire lives. But at no time has anyone suddenly decided that there is a need for the word "cheeser" to exist. And if anyone ever DID decide such a word needed to exist, it would just lead to debates like this, where people argue over precisely how much cheese one needs to consume, or the quality of said cheese, before one can legitimately be called a cheeser.
Unless gaming actually becomes a profession and there is a need for an official job title, the word "gamer" is equally as pointless.