>Travel time is the wrong property to optimize for when we're looking at transportation and urban design.
You'll probably eat those words. Or maybe your grandchildren or great great grandchildren will.
The value of human time has been steadily going up for millennia. We used to have slaves build pyramids and pick cotton, now we use machines. We used to churn our own butter. Now there's enough wealth in the world that we can afford to have butter specialists make butter and logistics specialists get it to the store shelves. Tasks that we used to think it was reasonable to allocate human time and effort two we no wouldn't think about doing manually today.
I would be highly surprised if in the future we did not continue to optimize for smaller travel times. Of course there are energy and space trade-offs. I think it's highly likely that we will chose to solve the problems caused by those trade-offs rather than having people endure longer travel times when we have the power to shorten them (with tradeoffs).
Spending less and less human time on "overhead" tasks (like churning butter, washing clothes, traveling, etc.) has been a constant theme for millennia. I do not see any reason why that will change.