Judging by current sales, it'll be well over a year.
There is more than enough inventory for current owners. Look past reservation walking, 7 months plus 10 days, and every single day is open, even Christmas and NYE. There is not enough demand of current owners to put any pressure on current inventory.
My guess is that, even if sales markedly pick up now that VGF is sold out, there will not be enough owner demand to trigger an inventory release for at least a year or longer.
I believe the numbers I've heard is that 40% of inventory is released and 5-10% of points are sold.