In some respects I think the USA have to get over the importance of one person.
Firstly, there is no one waiting for a momentary window to deliver a nuclear strike on the USA.
Secondly, according to the constitution, there is always a replacement.
Every other nuclear power seems to be able to manage to allow their heads of state to fly around without such a logistics tail.
To be perfectly honest, he is talking total sense, and being disparaged for doing so....