What's the problem? It's very well established that game mechanics can't be copyrighted and both the games industry and the games press know this. id Software

What's the problem? It's very well established that game mechanics can't be copyrighted and both the games industry and the games press know this. id Software doesn't own the FPS genre and Westwood Studios didn't own the RTS genre and, if they had, it's pretty clear that it would have stifled innovation in those genres.