All of his "sign and telephone" policies only require the new President to line through and initial.  He doesn't even have to wait for the US Supreme Court (who has already killed his 'recess appointment' attempt) to have his plans to combat climate change, his executive action on immigration, his transgender rights policy  (any bathroom in any school is fine) etc.

A stroke of the Obama pen is trumped, so to speak, by the stroke of  his pen.