#6 might be the only real chance the US has of having less divisive politics. Moving the upper middle class and wealthy out of cities could change the game entirely by making the political extremes less concentrated geographically.
rural broadband would need to be improved for this to work in general.
I'm extremely hopeful for Starlink and similar services. <100ms ping rural internet would change the game in a lot of significant ways.
5G may help to at least some degree. Most people don't need Gigabit or anything like that. But it's nice to have a better alternative to satellite and (sometimes) hotspots which are your only options if you can't get broadband today.