I am still hopeful that those marginal voters that voted for him (those who voted against Hilary, and those who only voted for him for the tax cuts) are now realizing that they got dealt a bad deal, and will vote against him in 2020.  I would guess they are enough to turn the electoral vote against him.  

Then there are those who now see their 401K savings down some 20%, they cannot be for him anymore.  The tax cut matters little if you are down so much.  

That said, I am afraid that if he gets a deal with China, it could garner him more support.  Folks just don't see the bigger picture.

The decision pull out of Syria is jut another reminder that this guy operates in a world devoid of any logic, reason and loyalty to our Allies. Let alone going back on your word/commitment.  Our credibility is gotta be at an all-time low.