Agree, probably your "american style medium density" is what I would consider "low-ish density", healthy and pleasant too...

...but using the "depleting oil reserves" and other eco arguments to make people leave in what I see as much lower quality conditions is inhumane and cruel in my pov - just build good quality public transportation, make it electrical (even trains are efficient) and go all nuclear to power it all, putting up with all the eco-consequences of it ...or maybe Elon Musk's Hyperloop will redeem everything :)