Donald Trump isn't short of opposition, but much of it has been strikingly ineffective.
Not only was impotent criticism a big part of what got him elected, but many of his opponents also appear to be slow learners. That seems likely to bolster Trump's support and sustain him in office.
The president-elect gives every impression of having already taken charge, a posture that his critics validate by treating every half-baked intervention (1,000 jobs "saved" at Carrier) and meaningless expostulation (flag-burners should have their citizenship revoked) as though it were an actual policy. At the hands of his critics, Trump's ridiculous running commentary becomes, "Trump is really shaking things up." In this way, by doing nothing, he's delivering before he's even sworn in.
Unfortunately for Democrats, whose job it is to oppose the Republican president-elect, Trump shares their disregard for limited government and market forces. This shuts down the strongest lines of criticism and introduces an awkward mismatch between the intensity of the Democrats' loathing of Trump and the substance of their complaints.