Similar problem here. We have stopped all delivery, work on new productions, but some hundred thousand applications are still around with customers.
@Adobe: It is a bad idea to check the "end date" of a timestamp! The timestamp's function is to keep the certificate valid. btw: There is no documentation saying that a timestamp itself will lose its validity - in many cases almost at the same time when the certificate period ends. Adobe must have seen the problem because current timestamps are issued until 2031 - out of reach for warranty claims.