I sympathise with some of what you say, but I'm trying to reconcile your preference for right-to-buy with your desire for a house price crash. Are you trying to put council house tenants who buy their homes into immediate negative equity???
Or do you want to have the price crash first and then have tenants buy their houses - compelling the councils to sell at the bottom of the market, like when Gordon Brown flogged our gold reserves for euros?
Secondly, while a house price crash would indeed make housing more affordable, the supply of housing at those depressed prices will surely be reduced - especially if people are pushed into negative equity. Who's going to sell if they don't have to? To say nothing of the impact on consumer confidence and the economy generally that such a crash would cause.