Well, that's a point of view, but with respect it is very much from the perspective of what a second home owner wants, rather then what is best for everyone. You have ignored the impact of second homes/holiday cottages/Air B&Bs on villages which are empty all winter, and the fact that in order to build enough homes for everyone to have one when some have two or more, green and brown belts will be eroded even more.
In my hometown, for instance, it seems that every blade of grass has a house on it - new estates are springing up all round what used to be a small town. The result of this is that schools, doctors and dentists are over-subscribed, the roads are choked with cars, and even the sewage system is under strain. Ok if you have somewhere rural to wind down in; but most people don't (and if they did, the problem of overcrowding would be even worse).