I don't see how it would destroy patent trolls. If anything it would just give them more runway, wouldn't it? They declare a high price they're happy to walk with and then continue trolling people with their patent. Corporations will pay the tax to maintain their patent and occasionally engage in minor amounts of corporate raiding against each other by "stealing" patents back and forth they otherwise maintain in perpetuity. Also, what if I build a business on my patent and someone purchases it away? Does the business go, too? Do I get a license? So on and so forth. This seems like an almost guaranteed worse system than we have already.