It's a bit of stretch to extend the crumbling nature of the US to the rest of the world. The complete failure to adequately maintain or renew key infrastructure is a political issue, not the inevitable end-state of your much trumpeted energy catastrophe.
On that note, I was pretty blown away travelling around the US at just how farked everything is. It's positively third world in a lot of respects. Especially in contrast to Japan/Taiwan from the weeks prior.
You still seem to be under the childish impression that things are just going to grind to a halt once we 'run out of fuel'. That's not how the world works.
New Zealand was once a gigantic forest of slow growth native timbers like Kauri, Rimu and Totara, these would frequently have trunks in excess of 4m in diameter - real monsters. The Kauri heart wood was dead straight, available in long lengths, was easily felled and processed, resistant to rot - an absolutely ideal building material. Vast tracts of forest were rapidly cleared in the late 19th/early 20th century, both to build a new nation and to make way for farmland, grass fed cattle/sheep etc. Pretty rapidly the country was running out of easy to obtain Kauri, prices rose, some remained but only in more difficult to access areas. As prices continued to rise, these areas became economic to fell and were eventually cleared. Once they ran out of Kauri, do you think they just stopped building houses? Alternatives were sought and found, after lots of trials it was found Pinus Radiata from California not only grew well here, but thrived - rising to maturity in half the time required in its native land. It would also grow in volcanic acidic soils that were unsuitable for most other types of productive farming. NZ now has a pretty extensive sustainable forestry sector, harvesting ~30 million m3 of timber annually.
There are articles from that period of history bemoaning the end of building, that nobody would be able to have a house, that the world as they knew it was going to come to an end. In some respects, I guess it did - the world moved on. It's bizzare now to look back on what is quite recent history, at the waste and the destruction. Similarly as oil becomes more expensive, both from the increasing difficulty of its extraction and hopefully more of its externalities included in its sale price, alternatives will become feasible. With feasibility comes demand, demand brings scale, reducing the price and resulting in a rapid pivot driven by economics, not the best intentions of the enlightened masses (hah!)
This has happened many times before, it will happen again. In not so many years it will be hilariously quaint that we used internal combustion vehicles driven by men for something so simple as bringing ore from the depths of a mine to be processed. Your children will think you were mad, driving a 2 ton vehicle full of flammable liquid, spewing poisonous gas in the faces of those behind in a never-ending queue of crawling traffic. We won't 'run out' of oil, we'll just stop using it because there are better, cheaper alternatives. Coal fired steam trains weren't phased out because we ran out of coal.
