stepaway: "I really have a very hard time with the idea that other people, who have chosen NOT to have children, should effectively be subsidising our decision to have them."
That is not a valid argument. As franca already pointed out, our taxes pay for lots of things that we may never claim on.
To take your argument to its logical conclusion, the current system of state funded education, children's hospitals, child protection and other child-related services, child benefit/surestart grant/child trust funds/childcare vouchers should all be dismantled. After all, by your reasoning, childfree people would never use them
As another poster said, who educated and cared for the health of these childfree people to begin with? For them to begrudge state funding families (which I don't see a lot of, tbh) would be equivalent to their pulling up the drawbridge after themselves. I have no sympathy for such a view.
That childfree people don't benefit from others' decision to have children is grossly inaccurate. Who is going to fund these people's state pensions and who is going to wipe the dribble from their chins in the care home they end up?