Obviously no one wants a population will kill everyone but its debatable whether we truly are there. But if we could overcome the environmental obstacles a bigger population with productive people is certainly better than a smaller one. So we should ultimately be working for a population that can sustain growth rather than one that simply shrinks.

Population growth should be seen as an extremely powerful tool with obstacles to overcome rather than an inherently bad thing. A larger vibrant population of (intelligent productive) people means more science, technology, goods, art, and everything else we need as a society and most importantly survival. A shrinking or stagnant population will lead to doom.