Here we go again with all the resulting paranoia so many willing to put 2 plus 2 to make "X".
I have no reason to believe that "short term" EZY are going anywhere. Reality is that they seem to feel that they can get better returns by placing their resources (aircraft) elsewhere hence the loss of some aircraft.
At the end of the day its as much up to how much the airport value EZY as vital to their business plan. Personally my feeling is that they would be fools if they were to take the more paroachial view that Jet2 / "eggs in one basket" approach would be in the long term a more suitable direction to take. No one seems to question the airport management "think small & you will end up small.."