Yes I believe childbearing is a right. At what point is it okay to intervene in someone else's fertility? Just (for example) because you may have been solvent when you had four children doesn't mean you always will be and the reverse is true.
Then there's the fact that in reality we don't have enough children being born to support the older generation. It's the reverse pyramid isn't it? It's much cheaper to encourage the current population to have children than it will be to import them at a later date when funds and energy have to go into integration and education to properly function.
In an ideal world no one would need state support if they were employed but that's not the way our economy is set up. No matter how you spin it, it's just not. There is far too much reliance on cheap, intermittent labour that can't fund what it actually costs to live here. As well as encouraging a population to hoard property as if it was a salary earning contributor to their house hold.
Personally I think housing is the root cause/possible solution to enabling people to be self sufficient. The government are more than happy to fiddle around in that free market so long as it's lining pockets so I fully believe they're capabale of levelling the playing field.
Social housing was never meant to be a safety net it was meant to provide employed people with a roof over their heads in return for payment. Managed properly it's self funding and creates opportunity and economic benefits that imho far outweigh what we have now pandering to the private housing economy.