If you talk about overlading only fuel issues, I think people adapt and will adapt. In Europe you mitigate the high fuel prices with smaller engines in general and many diesel engines. But now even in Europe diesel is going away, the only segment where it still use is in pick ups and large SUV. Actually 99 % of large off SUV and pick ups any good offroad. are diesel only, the only exception is the Wrangler and G wagons, who are really really expensive. And that is a problem.
The nice thing in the US is that if fuel is really becoming a issue you already have alternatives available, most pick ups and large SUV come either with an "eco" 4 popper turbo or you can keep your nice sounding V8 if you can afford it.
In Europe, unlike US there are also annual road road taxes, so even if you afford the fuel, the road tax on top of the fuel cost makes then unfordable for 90 % of people.
A couple of decades ago diesel was the go to vehicle for international travel, being it in South America, Asia or Africa.
Now with the modern diesel, is still possible, but a lot more difficult due to the big difference in diesel Sulphur content across continents.The emission controls also makes diesel fuel economy suffer, specially on the smaller ones, so basically they are useless. High sulfur is a problem for petrol engines as well, but there is much easier, you just half you oil service interval and you are ok.
Me, as a European I can't wait for petrol alternatives. The new Landcruiser Prado due in 2022 - 2023 it is rumored to finally come with a petrol or petrol /hibrid version in Europe as well, also we might get a petrol Hilux, and even sooner, the Ineos Grenadier, who looks very interesting though a bit of risk since it is completely new company.
Tech is evolving, now you can get a wrangler with the 2.0 turbo petrol. I recently did a drive test with it and on that drive test it only had 10 % higher fuel consumption than my new diesel pick up that has 100 HP less...
Only if the wind noise on the highway would not be so horrible, it reminded me of car from the 70 's , I would have bought it on spot..