20% 2nd homes includes seasonal camps, deer camps, and off the road system 4 season camps. Actual 4 season homes that are useable (ie on the road system, insulated, plowed, yadda, yadda) is a much lower percentage.

The real problem is more psychological, people want the idyllic Vermont of open land single housing. In reality we need a paradigm shift to communal open spaces and close co habitation, That means condos, apartments, and developments where grass is in short supply but woods are preserved.