Seems strange that after a long period when Leeds flights were not on-sale (leading to speculation that LS were to pull the route), they then put it on-sale only to withdraw after March 2012. Has this withdrawl been officially confirmed???
Regarding Rome, I doubt anyone else will pick up this route. Easyjet operated to Ciampio in the past from BFS and was pulled. LS also seem to be pulling underperforming routes from Belfast, with TLS now gone (possibly LBA). Pisa also operates a very limited summer season, so certainly couldn't see a full schedule to Rome.