Unfortunately, I'm not privy to the information required to full defend such a business case (such as the amount partner airlines pay Disney to advertise as their partner or place the Disney logos on their aircraft, or the amount various airlines spend in incentives to drive business to themselves, like cutting the cost of seats from $132 to $88 to fill empty seats or frequent flyer miles).
However, it isn't as silly an idea as your post makes it out to be.
There would likely be some restrictions on companion fares, but I bet I could put together a solid ROI case for both the airline and Disney that would show conservative profit numbers and increase in both flyers (over the course of five years) and DVC points sold (within 2 years), as well as a solid investment discussion for the DVD sales team to present to both new and existing customers. Given the amount spent to acquire new and retain current customers, especially in the WalMart, lowest bidder, no brand loyalty retail environment, it would be a boon to the partner airline to maintain a solid line of business.
I guess it is obvious, based on your comments, that you would not be within the target demographic, Annie; however, there are likely just as many members relatively near or above the 600 point mark that would be the target market for this incentive. The deficit begins to slowly shrink, as people add on a 50 points here and 50 points there. For instance, we have a total of 360 point, which means we would need to spend 240 to reach the incentive. If I were planning on reaching this point level anyway (or close to it), it would certainly make me take notice. If I added on another 150 points (100 at VGC and 50 at BLT, as we would
like to do), then that reduces the deficit to 90 points.
Also, I don't know why you are limiting it to WDW and Florida. There are many people West of the Mississippi that visit Disneyland, and tend to fly to get there. Quite a few are also waiting to get points at VGC, and would be in line for a new DVC resort at DLH, if it comes to pass. Someone with 200 points in Florida and/or Hawai'i, may just buy 200 points in California.
I don't think we have the proper information to dismiss anything outright, even if the idea was fetching.
On another thought, why would a 50% discount on APs be unheard of for a higher tier? The key is to make a benefit economically worth making the leap, even if the benefit is spread over decades.
ETA: I reread your comments, and you are right. It won't motivate those with 200 or less, but this isn't a bad thing, since a smaller pool of qualified individuals means less risk for the airline. It also provides a solid incentive for those that
do qualify, one that could very well make other take notice. Like most other incentives instead of the free airline ticket (total value over the life of the contract of $13,000), you could accept the $10/point rebate (valued at $1,000) if you are local and/or prefer to drive.