The author has apparently 'forgotten' that the US servicemen and women who were called back onto active duty after WWII for the Korean conflict was to "Fight Communism".   So was VietNam.  (Domino Theory?)  

His armchair Generalship was rejected in those subsequent wars.  The country wasn't willing to 'keep on going'.

Alternative history is nifty and sort of like "Could Obama have beaten Trump?"  No knows or ever will know what 'might' have happened.

It's like dead yeast in your bottle of beer.  It has no effect and never will.