I could be wrong, but I dont think its supposed to be the last one. Of course, that all depends on ratings. Dan Harmon is gone and they moved the montrer to Friday, so it looks pretty bleak. Still, dont give up hope yet. This montrer has a very loyal fanbase.
the thing is theyre really close to 100 episodes and the cast a dit that they would probably be granted at least the 100th episode, but no one could be sure. though i, along with 1073 other fans of community, seriously hope that the montrer will last for a longer time.. toi never really know with network television.