I was being flippant. We don't need more people. However, if technology advances sufficiently this planet can support a lot more people far less crowded that we are now.
I could see that. The need to clump together in massive cities may one day not be necessary. That started when people had to walk or ride a horse to work. With commuter highspeed rail and remote work, we can unclump.
That would help. You pack rats in too small a space they go nuts and start chewing their faces off.
I could see a spread out network of small communities. Plato argued that once a community gets beyond about 5k it start becoming dysfunctional. I think that is somewhat limit by travel time. We can spread out a bit more. I figure with autos and such, a 20k town is about perfect. AS long as it's just big enough to justify a Walmart and Home Depot.

Especially if they get those micro nuclear reactor going. Each small community can have their own.