But that is a time frame beyond which we can do meaningful planning. Going that far out, all we can do is make efficient built environments happen: well-built, well-insulated and well-sited buildings along ~gridded street networks with short blocks, the grid in cold climates tilted to catch some winter sun. There is nothing else for us to do at those time scales. Maybe utility easement location, but even that is debateable.
Things like residential design standards (beyond insulation and orientation) are meaningless at those time scales. So too are multimodal facilities, use restrictions, minimum parking, handicap access...and so on. [/hat]
The two - IA and human population - rose together as human population exploded, IA as a 'necessity'. Take away cheap energy and human labor must replace energy for production at such scales. One presumes profit will still be extant when the human population has less energy. It is part of the human condition - you can't wish it away just because of uneven distribution due to the human condition.