If Manitoba withdraws from its participation, then it would be an open market for the fishers. The fishers could sell to whomever they choose. The private sector or the corporation could purchase. The corporation would no longer be obligated to purchase all of the catch, so they could pick and choose how much, which species, which size, and so on, which is what they do with Saskatchewan.
Saskatchewan withdrew in 2012 from the act. They sell under contract to the corporation, and the same could happen.