Negative. You are totally, 100%, absolutely incorrect on this one. Discount rooms/package are a pool at each Resort, if it's not available anymore then it's no longer available. Where do people get their information?
All discounted rates and packages work this way... there is a limited number of rooms that can be booked with the discounted rate or package per Resort. Once they are out, they are out.
If you book a rack rate room at Pop and a Free Dining offer comes out and there's availability at Pop for that package, then they'll switch it over (which will require rebooking the reservation from a room only to a vacation package) ONLY IF YOU CALL AND ASK TO HAVE IT SWITCHED OVER AND ONLY IF THERE STILL IS AVAILABILITY, in other words WDTC will not do it automatically for you and the Resort Front Desks also will not be able to help you out either (the FD cannot changes package types or book packages, they can only do day-of walk-in rack rate room only reservations). Lets say you delay a couple of days and then the availability for Free Dining at Pop is then all taken up by other Guests, then you will NOT be able to rebook with Free Dining at Pop because it is no longer available... however other Resorts might have availability for that package that you can switch your reservation to.
Now you could be "one of those Guests" and scream and throw a temper tantrum to try to get what you want (PLEASE do not be one of those Guests!), but the offers states in more technical terms that there is limited availability, it can run out, and it might not be available at your desired Resort.
Discounted rates and packages are subject to availability, always has been... always will.
If your crazy talk was true, then EVERYONE who is staying during a Free Dining period would be eligible for it... when they are clearly not and multiple folks have stated in this very thread that they had to change Resorts because whatever offer was not available at the Resort they want to stay at.
Not to be snarky, but you are incorrect. As for Knox, he is correct and there's a reason why he's one of the moderators. He knows his stuff folks.
BTW, I'm a former Front Desk and WDTC Cast Member of about 15 years and I'd like to think that I know my stuff... and you are? 8