Goodbye to federalism then.
Let's just do away with the fiction of the united States, and name the country, say, Denali.
And have uniform criminal and civil law, modeled, say, on New York State?
Not quite. If it is a matter that the federal Constitution controls, the states and local governments must follow the federal Constitution. If it is not a matter governed by the federal Constitution, a state may make it's own law. Though it i clear that states have lost power to the federal government, it is not quite hopeless just yet.