More population means more stress on world resources even if we are clever at finding ways around the problems in the short term.

Again, I question whether this assertion is correct. We can be clever at finding ways around the problems in the long run as well.

Plus, as I mentioned upthread, we're actually pretty close to the endpoint here in terms of population growth. Global fertility rates have been plummeting for decades, as economic development spreads across the world. World population doubled from 1970 to now - it won't rise more than another 25% from current levels, and is expected to start declining from there to below where it is now. We know now what defuses the population bomb - economic development. Both China and India have fallen below replacement rate (China drastically so); Indonesia will probably be there within the next decade. So even just finding a way around the problems in the short run might be enough.