MJV isnt the most profitable for LS, i think you will find its the likes of PMI and TFS.
With easyjet operating twice daily with a 737 and Jet2 operating daily with a 757 and not to mention all the charters, Jet2s 757 was still full, as were all the other flights to PMI.
I dont think Easyjet competing on the MJV route will effect Jet2 to much.
From what I hear the KRK is only being suspended on a temp basis it will return, but with Jet2 now wanting to go down the charter and holiday package route I wouldnt be suprised it KRK goes.