You are right, this won't be good for the price of DEC and I think it is rather obvious, so I don't think it will ever reach the 66% approval to simply sell DECs on market. If a proposal like that ever passes, I think the game would have other problems worth worrying about more haha

On the other hand, a proposal to simply burn the DECs held by the DAO is much more likely to pass (and I will personally vote for it)