'FR and EZY are benchmarks'
Interestingly, the only route EZY has ever given up (to my knowledge) was LPL-LTN. That was due to the high opportunity cost. Other routes have certainly been reduced (the Scottish BAA airports have suffered) but due to high costs.
FR are fairly good at sticking with their decisions too, but have just announced some route closures (a small proportion of their total network). They also will reduce operations at high-cost airports, or as part of the negotiation process for future operations.
Compare that with (eg) Debonair, which pulled off Luton to Newcastle, Copenhagen and Perugia and MGL to Hanover - 4 routes out of the 15 or so they ever operated.