[tomp]

First of all, the consequence of free time isn't necessarily more children. In fact, as people move up from poverty to "middle-class" lifestyle (with more free time as well), they have less children.

Second, China solved the overpopulation problem quite well with the one-child policy (maybe too well, even).

[tomjen3]

About your China point - I would not consider anything that involved forced abortions to be a solution.