I mostly agree with you here, but you also have to take into consideration what living standards people will have, not just access to food and other basic needs; and I'm not entirely sure we could sustain the current world population at the living standards rich, developed countries currently afford - well, not as they do it at the moment, or not for long anyway. But, if we get rid of the consumption driven economic model, prevent waste, and as you say, promote better management and wealth distribution, maybe then it would be possible.
You are right, but wasting isn't part of the living standards... or at least it shouldn't. So currently we are maintaining our living standards
and on the top of it we are wasting stuff what would be more than enough for keeping all the starving ppl across the world well fed.
According to the UN since the mid nineties the fertility rate is continuously falling and they are expecting a trend reversal point around 2050 when the population will start to decrease. Actually in the developed countries because of the ageing population this will cause some serious issues.