Fortunately for everyone except Brian, who does appear to wish jet2 troubles despite his declaration, there is no indication that they are accelerating plans to retire the 757 or 733, and instead have been investing in fitting satcom, ACARS etc for when they start operating them again. Reduction in capacity has occurred by not having the normal summer leases from companies like Titan, Airtanker, etc.
That doesn’t mean that they won’t be making more reductions of fleet or staff, but there is no sign of it at the moment, and they have made a large investment in staff by making up salaries during the pandemic so far, which would be odd if down sizing was the aim.