easy
Just watch and see.
You're not immune. In fact, you're very much at risk of things deteriorating.
I'd say it's pretty certain that as soon as all these NEC contract joiners are in, then the "new" captain contract will be proposed.
And guess what? All those experienced FO's who are joining now will have absolutely no concerns in leapfrogging the existing easyJet SFO's who will, naturally, be up in arms about the injustice of it all.
It's so obvious, I really can't believe you're all happy for it to happen. But happen it will.