I'm sure I will be flamed but here goes.
I know so many older adults who live in family size homes long after their children have left. Would it not be better for the government to offer incentives eg no stamp duty, removal costs paid for them to downsize to free them up for those that need them more?
We do have a housing shortage and I get that we could always build more homes, but we are also heading towards a climate crisis and surely it's better to use what resources we do have more efficiently and plough less energy into creating more.
My MIL is case in point - she still lives in the home my DH and his siblings grew up and often expresses a wish to downsize but she doesn't have a lot of money to spend on things like legal costs etc.