To one of your inferences, there is nothing more frightening in the world than a potential resurrection of nationalism. But they are not saying that in Tehran, Beijing or Moscow. Rushing to fill the vacuum?
I note that, in Germany, and in an interesting historical parallel to the last time internationalism was thrust on Der Volk, the nationalist party has also seen a resurgence, not that German nationalism is any cause for concern...
My own take: there is much to say for nationalism. We could use a dose of it here regarding the wholesale export of US capital. An intelligent incentives-based industrial policy might be worthwhile. Consider Norwegian and Korean shipbuilding as an upside of a nationalist industrial policy.
Of course, some of the other elements of it can be more troublesome, but, as with all of the 'isms", implementation to fact is a critical and often damning step.