My guess its because SpaceX is the best chance to complete the moon missions. Its space race time (with China) so time to streamline the regulations.
I think the FAA can see the writing on the wall – with Musk being so closely linked to the President-elect, come January 20 there is going to be a lot of pressure on them from the White House if they aren't keeping SpaceX happy. So might as well get ahead of the pressure and make them happy now.
Let's pray he can do the same for general aviation, we sorely need cheaper and better alternatives to century old Cessnas.
Yeah and not having to breathe leaded fuel fumes and getting that stuff on our hands when checking the tanks.