This is a bizarre conversation, if you believe the housing crisis must be solved, just holding that belief means you're recognising a social need that as a society we have an obligation to solve, you've moved beyond "the market will solve all" to recognising it won't, because the market is not driven by social need, it's driven by profit. You've moved beyond "who gives a fuck?, I'm all alright" or even Scrooge's position of "Are there no prisons? Are there no workhouses" to recognising that this is an issue for us as a society, in a way the Victorians, for the most part, did not.
So if the market will not solve this problem, and you believe that it is a social need that must be solved, then the state must try to solve it and they must build social housing (the clue is in the name) to solve this social problem, and they must retain that social housing to continue to address this problem into the future, so right to buy can fuck off.