FWIW: your contract is with the OTA, not the airline. Calling AZ is pointless it seems. That is at least what I was told.
Expedia (in NL) is actively identifying the customers who bought the AZ EFs and is working with AZ on a solution. They have no power to force AZ to reinstate cancelled tickets, but the one-sided re-routings may be a different scenario. The fault seems to lie with the interface between AZ and the systems the OTAs use (Amadeus) and not with AZ's booking system itself. Of course AZ loaded the wrong fare rules into Amadeus but they claim it is the problem of the OTA that they allowed these bookings... So AZ's solution seems to be to reroute according to the (correct) fare rules that were in their own system. That takes a while, as AZ is now changing the tickets in Amadeus, a system that is not part of their direct booking process.
Expedia will contact all customers who are affected (probably with the reroute information) and only when your ticket is changed by AZ can they act. If you cancel tickets proactively you might dig a small hole for yourself, especially if you paid booking or credit card fees.
The usual caveats apply for this analysis of course.
