Some of the adverse consequences of Obama's actions won't reach fruition until after his presidency ends. Some of those consequences will be irreversible. For example, the decline in America's standing in the Middle East can't be reversed. Neither can the hostility of Russia be diminished. The decline in the quality of the delivery of American medicine can't be reversed either. All of these things are attributable to the man who promised to transform America.
No question that the full gravity of his actions will not be transparent until some years after he has left office and the ill effects will be felt on a generational basis.
In many regards, Obama is a contemporary version of Pierre Trudeau. To this day, we are still paying down the costs of the workers-paradise that he attempted to engineer, regrettably, I suggest that this will be the case for the USA with President Obama's attempts at social engineering, an unaffordable green agenda and ACA (among other things).
You also touched on another important consideration relative to the intangible costs such as America's standing in various regions across the globe. The only way to assess the monetary cost is on an after-the-fact basis once things have settled down.