Poor Rory - killed and then retconned out of time. Sound like someone doesn't like him.
Given the "Chekhov's gun" in the shape of the Engagement Ring (the taking off of which was one of the poorest bits of writing in the series) I wouldn't bet any money on his not being back in two or three episodes time.
After all, at the end of the day the TARDIS won't
be destroyed, so the Crack won't be formed.
Ah, but then the Doctor won't meet Amy, and won't do all the stuff he's done so far.