crisgel - I'm in the same position as your daughter, I rent a very nice flat but it will be a long time before I am able to get a mortgage if ever. However, just because I can't/don't own my home, that's no reason for me to need social housing, I can pay rent. While I agree that in this climate (and most others), some people will not be able to afford their own home, it doesn't then follow that they'll need social housing, some will (your daughter and her partner perhaps) and some will not (my partner and I).
What would be good for your daughter and I (I suspect) would be if there was a look at the rents people are paying for their properties. I think that there needs to be some thought in to this as rents can be extremely expensive. And actually, some thought in to how mortgages are given, what I pay in rent would definitely cover a monthly mortgage but I lack a deposit; I'm sure that there must be a more sensible way in this respect.