If this were truly the case, it would have been long ago since we had Quake and Unreal on the platform already. Linux gaming is only going to succeed if Steam does.
I bought my first Macintosh just to be able to play Q3Test, before it was released for Linux or Windows.
Saying "Battlefield 4 will be released for Windows/Mac/Linux" doesn't mean nearly as much for Linux as saying "Battlefield 4 will be released for Linux-only this year".