No, we should not move to a national educational system. Not entirely, at least.
There should be some basic national standards, but they should be general standards, standards which do not change every 10 years. It should be up to the states to refine those general standards and put them into working concepts. Once they are put into working concepts, it should be on the local school districts to best implement those concepts, in a manner which is appropriate for the area of the country they live and the student population they serve.