Well since the people they are moving are mainly in the scientific portion of the agency. This will first of hamper recruiting. A decent scientist does not want to work in Kansas in the field of climatology. They want to have easy access to universities and the infrastructure that goes with it. Furthermore, I can imagine that a lot of people currently employed will not want to move. This would hamper the workings of the agency in the field of research.
For starters, Kansas City, where they are moving is in Missouri, not Kansas.
Climate change is a tiny part of what the ERS does.
Believe it or not, there are universities in both Kansas and Missouri. There are a lot of people graduating from very fine universities that do not have any desire to live in DC, so they now have access to that talent pool.