Until recently, the debate between "Left" and "Right" was restricted to two flavors of globalism. The globalist left wanted internationalism with more bureacracy and government regulation. The globalist right wanted internationalism with a little less bureaucratic oversight and regulation. Neither questioned the fundamental assumption that destroying national sovereignty, opening the borders, and outsourcing money and industry were fundamentally good things.
Now, instead of their fake debate over tactics, we have a real debate over the assumptions. That's why so many establishment Republicans covertly (and sometimes not so covertly) supported Hillary, and why European pseudo-conservatives like Merkel will eventually form coalitions with Socialists against rising nationalist parties.