Good luck getting the first two passed into law, at least in the US. "Encourage couples..." will get no traction. We still have a ton of littering, and all the religious groups in the US (the Quiver Full movement etc) will love that. Cutting trade based on a country's birth rate and adding tariffs based on EI etc will be extremely problematic.

Sure anything can be done "democratically." But politics is the art of the possible...