The original low cost carriers (like easyjet and Ryanair) seem to have overlooked the fact that they don't have the market to themselves anymore.
Every man and his dog is either a low-cost carrier or operating close to a low-cost pricing (fare) model so if one pulls out there will be several ready to take on the routes if they are close to being profitable.
They days of easyjet or Ryanair being able to throw their weight around willy-nilly are history!