Being forced to sell property in order to pay for its unrealized gains is a big problem. Imagine that it is your home that you have to sell.
well obviously it is a big problem but that's where we are headed so we might as well get used to the idea. people are going to need to start saving money to pay taxes. so they can preserve property that is important to them. in a sense, people can be forced to sell property already here in america in things like bankruptcy proceedings and such so it's really nothing new.