there's still people playing socom and warhawk so i don't think you have anything to worry about there.

Oh, you want me to get out my crystal ball? .... :\

not for every gametype, but i see what you're saying. i'm not sure the player count would ever get low enough for it to make a difference though.
 
in this case it's also one of those things where you're part of the problem and potential solution as well, because if enough people don't buy it because of fear over it dying, it will probably die out a lot sooner.
 
if it was me i'd buy it while i felt like playing it and enjoy it, not caring who else is gonna be playing a year later, because i might even get tired of it before that.

I think even when the player base dwindles down, there will still be enough to play the large matches since the servers aren't like Warhawk where there could be many people creating rooms and spreading the player base around. Instead, everyone will be paired together in the few large matches.

" but the size of the games could come back to kick them in the ass after months, casue it's wont be the matter of finding a few people for a game, you'll need 120. or 256 "

Personally, I can't wait til everything dies a bit down in the player base right now and we end up getting the people who are very loyal. This will lead to better games, and more action as people will finally know just what the fuck they are doing on each map.  
 
This game will be great in the future, especially if Zipper releases new DLC and Map Packs... etc.