For the next kid to have higher possibility of finding a energy generation method in next 2 or 100 years, they would have to have the knowledge of the world a.k.a different fields, which we have already divided into thousands of subcategories, for more research purposes.

It would be nothing short of a miracle if someone stumbles upon something like that and hence has very low chances. Similar to how ARM was built, by a person researching processors, and provides significant difference to the world. Earlier we were all going to doom very early with carbon emission from Data Centers utilizing no clean energy , our vehicles using non embeddable computers and factories. Each micro power consumtion could have made the world unsufferable by now, but somehow we delayed it. Some credit also goes to Covid.

Also, at current rate of tech growth with Cryptocurrency, sooner or later Governments are going to tumble (democracies only) as they will not have resources or the monetary capacity to control their areas. Something, like what happened in Bangladesh or Pakistan(when debt is high) would happen. So, no one to come together to fight the next big apocalypse. And as individuals humans are more destructive than constructive. Hence, mathematically instatable, but that's what hope and miracles are for, right? or should we change the way we live and go into hibernation for survival until our biological selves evolve to find the better solution, maybe that's what our last civilization did and we are here, having a far more technological world, but not scalable or sustainable. or we could leave it all up to the creator, or maybe aliens, another civilization from another planet acting as a parasite until we all either de-evlotionize or die out of existence.