This type of gamesmanship happens on both sides of the aisle.  Your side doesn't like it?  Then win the presidency and the senate, and the issue goes away, short of a filibuster.

Speaking of filibusters, there are too many Democratic senators up for reelection in two years who reside in red states, to make that a viable alternative.  Unless he/she completely crashes and burns during the committee hearings, Trump will get his appointee approved.