[Meatex]

all games see a steady increase in numbers of players initially and that rate slowly goes down until number of new players joining is lower than number of players leaving
Players will always leave games for the latest and newest games, or games they happen to enjoy more or study, gf, work and so on. Doesn't mean game is dying or in dire straights - there will always be a solid player base, outside of SEA ;P, because Starcraft 2 is THE current RTS and unless EA gets its soul back from the devil and by some magical powers from beyond the next C&C game turns out to be good, balanced and competitive then SC2 will remain THE RTS game for some time

And just because there aren't 100 tournaments a year doesn't mean there won't be plenty of good SC2 competitions to watch for years to come