Defined benefit changes should he retire

Listening to all the news about DB schemes and deadline of June to get things in order. Will companies who have a defecit in their schemes now move to change entitlements. A friend is in a db semi state scheme has 40 years done but cant afford to go. Is it possible he could end up getting a lower pension if he stays on and if so should he retire now and try to get job elsewhere. He is paying into pension now for no extra benefit.

Yes that is possible even probable, often moves from pension accrual of 1/40 for each year of service to 1/60 or 1/80,there are many examples of this out there.