Could they shift the existing DVC room stock into the main GF buildings à la WL or Poly?
Legally, no. When a DVC ownership interest is purchased, the points are tied to a specific unit. Ownership deeds indicate the unit, number of vacation points, and the percentage share of the unit. Unit numbers do not correspond to resort villa numbers. Moreover, with most DVC associations, one unit might be a block of several villas. Someone would really need to dig, through filings, to identify the resort villa numbers that correspond to their unit.
To raze the entire resort, including the villas, Disney Vacation Development (DVD), would need buy the ownership shares back from the members to which they were sold.
In 2007, Disney Vacation Club launched an extension opportunity for its Old Key West resort. The debacle is still discussed on DVC discussion boards. Some members did not want to pay for an extension, so Old Key West ownership shares may have an original, 2042, or extended, 2057, expiration date. If Disney Vacation Club was unsuccessful at getting 100% of its owners to purchase a 15 year extension, could you imagine how challenging it would be to have approximately 10,000 VGF owners sell back their contracts, which were to come with a lifetime of memories, year after year?