Tis true, there are far too many people in the world to even out the distribution of technology and resources, at least any time soon. Though if a few technological advances came in rapid succession then I believe we could find ways to reduce the amount of materials and energy required for devices and make them available to everyone, and also new ways of food production and water purification. Looking back at the past hundred years it seems quite likely such technological advances could could develop in a relatively short time.