I think, as with all these things, it takes careful footsteps to unwind a situation that we've spent years getting ourselves into.
Politically and from a humanity pov you have to be careful when dealing with people's homes. It's a safety pillar of life, roof over your head, somewhere to shelter.
Create carnage and pain in this area and you'll pay for it politically or visible public unrest.
We obviously need a bottom level of housing, and it's probably only coming in the way of social housing. Private housebuilders, at the moment, can't build units cheaply enough (regardless of an 'affordable' tag). Right to buy was a good policy but an incomplete loop. Keep ploughing the rent money and sales money into new social units. With councils having priority over their own land and private land opportunities.
With modern materials and technology, there are many factory built home construction techniques that would provide cheaper units and better quality consistency. Traditional house builders have no interest in this they're stuck in their own methods. Government should 100% be looking at this. Singles/couples don't need much 30/35sqm can look as cool as fudge (just look a the IKEA room mock-ups
).
The bigger question is ...how do we get affordability levels to a sensible 3-4 X earnings from where we are now, without too much carnage and pain?
The obvious answer is they'd give their £1500 a month rent to a mortgage lender instead.
Of course, with the caveat, that paying so much rent might have negated their ability to save a deposit
(100% mortgages anyone?...in a falling market)