^ There is already no room for Fringe.
Fox has ordered pilots to like 10-15 different shows when they have room for maybe 3.
Maybe they pick up two pilots instead of three then. Yeah, that's not likely with Fringe's ratings, but the point still stands that Fringe won't be cancelled in isolation, but in comparison to how much better FOX thinks they can do with one of their new pilots. Maybe their pilots will turn out worse than expected, and that will work in Fringe's favor.