That would be great. As sovereign entities, the states could then decide on a year-by-year basis how much they should send in and how much they would withhold. Some states will simply decide they can use the money better back at home.
One insanity of our current system is that it requires individual taxpayers to funnel vast amount of money to the federal government, which then, via a spoils system, gets to decide how much it sends back down to the states.
On top of the rampant corruption of this system is the incredible inefficiency of the vast bureaucracy required to implement it. One of the additional benefits of reform would be the elimination of thousands of government jobs which are a huge drag on productivity. Most government “jobs” are just a more expensive and slightly more respectable sort of welfare.