well, first off the thing that generally sustains the life of an online shooter after the first few "ooh ahh" months is the competetion. my definition of a game being "alive" are online clans/leagues/ladders, and since JK2 is really competitively inferior (which saddens me more than anything) do to a number of things, the game just doesnt have that big of a following. so disappointing too, JK1 was like a very competitive scene, and now this crap. well, my 2 cents.
PS, the first sign a game really IS dying, is a "hey this game isnt dying!" series of posts