If it takes 30 people to call it a MMO, would that make Counter-Strike MMOFPS in some cases? I've seen 32 (and much larger amounts on lots of servers) players in one game. A game as "revolutionary" as PlanetSide can have well over 300 people in one place at one time. The only problem with PlanetSide anymore is getting people to play. Development has been progressive, yet slow. SOE kind of spread themselves thin for it.

WW2OL and PlanetSide definitely paved the way for other MMOFPS to come along, but there's really no better way to do it than how they pulled it off.