Quick solution;
95% LTV 2.5% mortgages fixed for the lifetime of the mortgage for first time buyers.
everybody would have access to a roof over their heads that they own.
upgrades / moves / rental / etc would then call in higher rate mortgages / tax etc.
Banks will not offer that, so it will have to be government-backed. Similar to the Netherlands (which offers 100% LTV or sometimes even 110% LTV).
I think that is going to happen here as well.