Barring attempts by the government to "engineer national policy" (i.e. f*** up everything), population will (like most natural phenomena) oscillate around an equilibrium -- people have few children for a while, land and housing get real cheap, people start having more kids, livable regions get annoyingly crowded, people start having fewer kids,... and round and round the cycle goes.
Ehrlich would look at a patient catching a fever and predict spontaneous human combustion. London would look at a patient recovering from a fever and predict a corpsicle.