Its a fair comment that the overall community is fragmented between quite a few games. According to Gamespy, the big-hitters right this moment are:
Half-Life: (19997 servers, 52068 players)
Medal of Honor Allied Assault: (707 servers, 4451 players)
Return to Castle Wolfenstein: (1121 servers, 4015 players)
Quake 3: Arena: (2877 servers, 3836 players)
Unreal Tournament: (3374 servers, 3560 players)
Jedi Knight II: Jedi Outcast: (602 servers, 2378 players)
Tribes 2: (606 servers, 2352 players)
(Note: I have all of them...)
On the other hand if this is such a bad thing, what can be done to change the situation? Shall we ask all the different developers to stop developing new titles? Maybe tell them they should all work on one title together? All unify behind just one popular title to bring the community "together"?
I don't think thats going to work...