I can't see why EZY can't do more flights from euro-based aircraft. Cities that are bases like the upcoming Amsterdam base, Paris, Hamburg, Milan, with other new routes including Naples and Basel, and especially those with multi-daily flights.
Milan isnt double daily, so although an increase to Rome could be likely I dont think we could see it go much above that.
Any new gaps found for based aircraft could be used to strengthen the summer schedule - maybe with the discussed possible further movements from Stansted.