Modern sewer systems are safe

They produce biosolids which are probably very contaminated and are presently jammed into landfills if they are not (from my understanding) unsafely repurposed. I’d like to see people openly entertain the various uses we could have for our waste. Our systems aren’t good enough quite yet to close the book on.

connect with high speed rail isn’t feasible

From my perspective, high speed rail is very feasible for freight and transportation. Does it make sense to connect to every remote and mostly uninhabited region? Probably not.

We need to work on our communities

Hard yes. I just feel that it’s very difficult to connect when you are so vastly disconnected in current cities.

and make cities safe for people to live in

We’ll have to get very serious to tackle our pollution and polluting practices to do so. I think a large number of cities will have to naturally relocate/rebuild as the situation shifts in the coming decades and that is what I was attempting to touch on.

get rid of cars etc. spreading out isn’t the answer

I’m not explicitly arguing against centralization or arguing for dispersion into rural areas, and I do agree with you largely. I think accessible high speed rail is one way that we can get rid of cars and other vehicles.