Well, Trumpism is a cultural/nationalist movement, not an economic one. What is really left of the Republican party, and who will be left to build it when Trump is revealed to be a total fraud at best? The two major pillars of the Republican party post-Reagan (neo-libs and neocons) are just about dead, and the libertarian Tea Party wing is represented by Rand Paul almost entirely.
The far distant future is probably some form of socialism, but until then there will be a balance between government intervention (socialism) and free market capitalism. You say socialism is a failure, but lets be clear that modern capitalism has never been implemented without an equal measure of socialism.