EasyJet signed a ten year deal in 2011, starting a base in 2012 so that will take them to 2021.
(i am not aware if any of that has changed during the contract) so think it unlikely much will change short term.
Personally I think the talk of a Wizz base would have been a better fit for SEN with minimal overlapping of routes.
Good news for SEN now, only time will tell what happens in the mid term