Right now, as of end of book 5, Sansa, Arya, Bran and Rickon are for sure alive, and Jon is stabbed and could be alive or dead, only GRRM knows. Catelyn is a zombie in that she died and came back as lady stoneheart to take vengenace on all Freys. Ned is dead. Robb is dead.
So still lots of Starks around to come back and kick some ass. In fact, i believe that book 7 was rumored at one point to be titled "A Time for Wolves" so hopefully the Starks win in the end. Nothing is sure with GRRM though.