If I need to cite it I will link to specific relevant moments in the talk? Okay?
However, to summarize:
Complexity requires energy, as societies get more complex the problems they have to solve eventually overwhelm said society leading to the collapse of complex societies. Societies do not by default become complex, and many often avoid complexity because of the costs and difficulties associated with it. His point is that we, like all civilizations prior will be overwhelmed by problems, even as we solve other problems our solutions will have problems of their own.
Societies may change, but do they change multiple times in a single human lifespan? Do they have a constant need to change and is the change always all encompassing and global? The problem today is that we make lots of rapid changes that outrun the ability of any human to "adapt," to them. Education gives no sense of stability of it assures nothing and consumes time. Consider this, effectively education today is "Sink 4-6 years of life in an institution to get a credential that costs you the equivalent of a house that assures you no career or secure job." Now the job market is increasingly casual, temp work and insecure. Jobs have few benefits, no stability, nothing to build a life on.
Even now, the stability of knowing what you will be doing in 10 years with any confidence is just not there, people can't plan a life around that kind of chaos.
Policies proposed by Trump enjoy popular support, not necessarily corporate support. The Investment banks are with Clinton, Wall-Street is with Clinton, its Labor that isn't largely with Clinton..... well the actual Laborers that are not.
Globalization has its costs, those costs IMHO are not being dealt with. More importantly,
problems tend to not come at you individually, as Dr. Tainter puts it, the issues a civilization encounters will often seem tractable and solvable at first but these problems often develop commutative costs.