This time Congress stepped in and included it into the H.R.2810 - National Defense Authorization Act for Fiscal Year 2018.

H.R. 2018-329 s 1092(d).

(d) RESTORATION OF RULES FOR REGISTRATION AND MARKING OF UNMANNED AIRCRAFT.—The rules adopted by the Administrator of the Federal Aviation Administration in the matter of registration and marking requirements for small unmanned aircraft (FAA-2015-7396; published on December 16, 2015) that were vacated by the United States Court of Appeals for the District of Columbia Circuit in Taylor v. Huerta (No. 15-1495; decided on May 19, 2017) shall be restored to effect on the date of enactment of this Act.

And now it is the law.

Wayne