There was a fire at Terminal 3 at FCO some months ago and many passangers have to go through Terminal 2 now which is not the best solution. Also there are a lot of delays at FCO due to construction workings at the terminals and runway closure. My EZY flight was delayed by 2 hours (as aircraft has to wait before take-off as just one runway was open for take-off) and back half an hour (due to heavy traffic).
Reliability at FCO is not the best at the moment. Maybe once constructions are done EZY will come back?
Increasing competition from VY, FR, DY and W6 is also a good point. EZY should be the market leader at MXP, VCE and NAP. Fair enough to look at those points. Sicily is left out a bit, maybe CTA and PMO will join the EZY bases?