That's true. And doesn't the show need to be given a greenlight for a sixth season as well?
Anyway, we are pretty lucky that we have five seasons, so if they decide to stop the show there, then that's fine with me. I agree with the previous threads, better to have an actual plot and a satisfying ending than to let to show drag on.
Of course, some of you guys can hope for a Season 6, but remember that there is a slim chance of it happening, so don't get your hopes up too much.