That seems like a buyer beware situation. Nobody forced them to invest money in it, and if they lose out in the end that is the risk they take, the same with any other investment. You can't buy a piece of commercial property and not pay any taxes, or start a business and then claw back taxes you already paid because it failed later on down the road.
It would probably need a grace period so things don't go crazy, but after that then yes. It would also have the benefit of pumping stocks being lower and more risky, and could help prevent stock bubbles from rising so big and fast.
