That can always be an argument. You could place all humans in Great Britain easily. Would perhaps be more productive as well. Imagine all the biotopes that could strive again. But it isn't a question about productivity and I believe the vast majority live in high density setups for utility. At least I do. It is nice enough but it remains a compromise.
Not from the US, but expect this story about high density areas paying for the others is a stupendous political argument to get people angry at those suburbians and not too much else. The distribution of funds is probably unjust, but the solution is certainly not to bring everyone into high density living.
The solution is to enable more mixed-use zoning and enable more dense development. The situation in North America is that we can only build low-productivity, high-cost, environmentally damaging suburbs. Which, in turn, leads to noisy, polluted cities with high levels of traffic congestion, collisions, and massive amounts of unproductive parking lots.
Plenty of European and Asian cities are good examples of how one can transform modern cities to be better balanced and pleasant for humans to live in.
Not from the US, but expect this story about high density areas paying for the others is a stupendous political argument to get people angry at those suburbians and not too much else. The distribution of funds is probably unjust, but the solution is certainly not to bring everyone into high density living.