Well, you have successfully demonstrated that an strawman plan that nobody would ever dream of implementing wouldn't work. That isn't hard and I am not sure why you put so much effort into it.
San Francisco is a horrible example because it notoriously does really bad at density. Then you halve that density to make it even worse, which will of course force massive problematic sprawl. This alone makes the rest of your long comment pointless as you spend the whole time talking about the problems caused by running out of space due to your low density.
In fact, all of the challenges you've listed are easier to solve with high density cities.
Higher density cities have less water use per capita, so they make it easier to supply any given population level with water. However, I don't think California can support 100mil without large desalination projects.
Higher density cities use less power per capita, plus lower transmission distances reduce upkeep per capita.
With waste management, again you get higher efficiences with higher densities.
Higher density cities mean that you have more room for green space and recreation areas and they can be situated close to the people who use them.
Sure, those who find nature and wilderness attractive will find denser cities less attractive... but those people already find them unattractive.
San Francisco is a horrible example because it notoriously does really bad at density. Then you halve that density to make it even worse, which will of course force massive problematic sprawl. This alone makes the rest of your long comment pointless as you spend the whole time talking about the problems caused by running out of space due to your low density.
In fact, all of the challenges you've listed are easier to solve with high density cities.
Higher density cities have less water use per capita, so they make it easier to supply any given population level with water. However, I don't think California can support 100mil without large desalination projects.
Higher density cities use less power per capita, plus lower transmission distances reduce upkeep per capita.
With waste management, again you get higher efficiences with higher densities.
Higher density cities mean that you have more room for green space and recreation areas and they can be situated close to the people who use them.
Sure, those who find nature and wilderness attractive will find denser cities less attractive... but those people already find them unattractive.