While the majority of Trump's supporters (i.e. 51% of those 45% of voters in Nov, and falling based on polls of Trump's support) may not understand major global political, trade and negotiation matters, his climb down does have implications on how other nations will approach negotiations.  

Nations like China will calculate Trump's quick turtling as they contemplate trade.  I can't imagine they will need to call up Trump Supporter #108 in Alabama to ask what strategy they should take over the next few years.