To be serious for a moment, the office does need a safe and secure mode of transportation such as the VC-25 has provided and obsolescence is intolerable.
That the president-elect seems to regularly shoot from the hip ("ready-shoot-aim") is likely to result in some missing toes (i.e., costly interruptions).
In the meantime, there are long-legged Gulfstreams, also dedicated to presidential travel. But the staff and press will need to follow in another aircraft. He could still Tweet and stay in touch.