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I'm sure you know the haves and have-nots don't divide into equal parts. A very few haves consume far more than the majority of have-nots. So sure, you can stretch your allowance out if you put a progressive squeeze on folks proportional to their uptake.
But see, I'd like the have-nots to have more. I'd like my children, and their children, and on down the line to live increasingly richer lives. And I wish the same for everyone else as well. There's no way any of those things will happen if the world's population doesn't significantly decline. The only thing that could change that would be the invention of viable nuclear fusion power generation. Without that, it's only a matter of time before the well runs dry, no matter how much the top 10% conserve.
It's time to stop trying to see how many rats we can fit into one cage.