That assumes one parent from each family wants to forego a career to focus entirely on raising kids though.
Doubly so if "affordable for the parents" means "affordable for parents who are in the same income bracket as your average pre school teacher."
Source: I've served on the board of a day care.
The other piece of the puzzle though is that there need to be sufficient providers, which can't happen instantaneously. So you'd have to scale up such an initiative in a sensible way.
I know that borders on callousness, and obviously I don't think we shouldn't take care of single parent households that don't have an option or that the child tax credit shouldn't be high enough so kids don't go hungry. Just if you reduce this to the choice to have a child and a lack of outlying circumstances, you shouldn't have a kid if you don't have someone ready to take care of them and the freedom to make that choice.