Apparently no restriction should be done before the clients supporting convenient solutions to avoid address reusing. Otherwise you are trying to kill BTC rather than helping. Please spend more efforts on clients instead of mining softwares. No project will succeed in going to mainstream try to piss off users just for pleasing some genious developers who think they have better vision of the future. BTC now is no longer the toy of developers as the early days. You are dealing with billions of people's money now.
This patch isn't designed to restrict, it is designed to discourage.
It's not just discourage as you think, it's forbidding in some scenario. If a merchant use a fix address to receive payment , it can only receive 6 payments per hour. Basically makes the service useless. It's customers have to wait forever if there're more than 6 payments per hour.