Price appreciation alone isn't enough to force people to sell - they can take out home equity loans, and the appreciation is more than enough to cover the incre

Price appreciation alone isn't enough to force people to sell - they can take out home equity loans, and the appreciation is more than enough to cover the increased taxes and interest payments. "Doubles in value every 8 years" means something like 9% appreciation, HELOC rates are 5% and property tax rates are below 2%. Starting with a paid off house, you can take out home equity loans to cover property taxes forever with that rate of price appreciation.