The Museums would stay in DC. The departments no longer need to be close to the capitol. Move DOE to texas, Move Agriculture to Denver or Kansas City, Move Education to Ohio, Commerce to California, etc.
The senators and congressmen should meet and conduct business in various conventions centers around the USA. Would this cost a lot ? Yes, but the savings in getting these people out of DC would be 1,000 times greater.
Your ideas are interesting.
The article’s idea however are just bizarre.