I don't think it'll be an eco-chic lifestyle, just what's financially viable if oil goes up high again. China doesn't have more small EVs than any other country because they all want to help the environment, it's just because it's the best option given the circumstances. The same will apply other other countries wrt personal transportation sooner or later, because oil won't be around forever.
As for TOD piece, it isn't exactly rigorous. For one, assuming we won't change any of what we do today and need to base the population of off that is quite lemmingish, and more or less impossible since the thing about people is that they always change. If we were to apply it to a time when we used way more FFs than we do today, we could make the same argument and come up with a population that's a tenth of what's mention in the thread, yet somehow, here we are, with renewables expanding. Linking GDP to consumption in a direct way is also kinda weird, since renewable electricity alone is about $400 billion/year. Granted, current ag practices aren't exactly sustainable, but even adjusting for the green revolution and all the associated FF use, there's still another $500 billion or so via sustainable ag. We've only looked at two industries, and already we're well above the $500 billion/year cap, which doesn't bode well for it. Of course, lack of change also sinks that ship, but that's more or less a given.
We should stand back and look at stuff analytically, not just open our noggins and shovel it in.

$this->bbcode_second_pass_quote('Professor Membrane', ' ')Not now son, I'm making ... TOAST!