Did you pay the difference between a new AP and your ticket value or did you pay the full AP cost? Because it has always been the case that you have to upgrade tickets while they are still valid, which means 14 days from first use for the non-date-based tickets and with at least one entitlement remaining. It sounds that you purchased new APs, in which case, yes, they have to be activated. Or did you have the super old non-expiring tickets?
All 4 of us have activated APs (so the non-activated discussion does not effect me personally), but still, I would hope they do not do this. If their IT allows the non-activated APs to sign up, then those guests will be making travel plans and I highly doubt Disney would risk creating ill feelings by canceling those reservations.