Because it would look weak if POTUS rolled up in a 2 engine wide body when Putin, Khamenei/Rouhani, Mukherjee, or plenty of others have 4 engines. Duh.
I also have to laugh when they say it's approaching the end of it's 30 year life span when the airplane I fly is double that.
But, I am just pleased it went to Boeing without a long drawn out bitchfest between them and Airbus.