That is a very interesting idea. But I think you would want at least a 14 year grace period with no property tax. Another possibility is a use-it-or-lose-it s

That is a very interesting idea. But I think you would want at least a 14 year grace period with no property tax. Another possibility is a use-it-or-lose-it scheme like that used in Trademarks. If you built a game that is now abandonware, it should be fair game for someone else to remaster it, etc.