Technically speaking, JW doctrine style, that is... if I remember correctly, one can be DFd for apostacy, yet come back to the congregation, repent, be reinstated and still survive the Big A.
Now, there is a provision for being cast out, never to return and that has something to do with sinning against the holy spirit, which involves more than just plain ole everyday apostacy. I never got a good handle on it, but I think it was just mumbo-jumbo to keep us all in line from even going anywhere near the line of doubting or questioning.
But it wouldn't surprise me if they, in time, (if they haven't already and I just havent heard about it) make apostacy in general a sin against the holy spirit, with no hope of coming back or surving the end.