I'd like to think that their globe-hopping junkets where they take the entire extended family anywhere they feel like going will stop being at the expense of the taxpayers, and will have to be paid for by their supporters.
AF1 is exclusively for the use of the President. They will not get to use US Government aircraft after Jan 20, 2017 unless the new President or other senior official allows it.
However, the UN has several planes, and Ban Ki Moon’s term as Sec General of the UN is up at the end of the year, so...