In what way did the housing market collapse? The only thing that changed was the availability of irresponsible loans to people that can't afford them. Tighter regulation of lending.

The effect on housing prices was a mere blip, and banks are back to their old tricks again. You're right about the same crisis repeating: there's more packages of bad debt that have been sold and re-sold as if they have any value, this will almost certainly come home to roost again but on a longer timeline it's not something that will 'fix' the global housing crisis because supply:demand has not changed in any meaningful way.

If you are a private investment company with wads of cash, you'll take advantage of the temporary instability and buy up massive amounts of private land and housing. Problem just gets worse in the long run because we keep propping up the system that rewards this behaviour.