I really can't believe you are asking such a question.
The supreme court doesn't do anything to decentralize the power of the government.
The US Supreme Court has 3 basic functions.
Settle disputes between the states.
Hear appeals from state and federal courts.
Determine constitutionality of federal laws.
The US Supreme Court is a reactive body, not a proactive body as you are suggesting.
Nope. Not suggesting that.
The Supreme Court can centralize or decentralize power through their reactive authority.
* Settle disputes between the states: Frankly, I haven't heard of a case like that, but they could easily rule that whatever is in dispute is now a federal matter.
* Hear appeals from state and federal courts and Determine
constitutionality of federal laws: The second comes from the first. I'm not aware of any law going directly to the Supreme Court to determine constitutionality. Every case they hear is ostensibly to weigh the issue against the Constitution. If the justices decide it is a state issue, I would assume they would simply refuse to hear the case. I'd love to hear of them striking down a federal law.
I searched online and the most recent time I could find was this:
Retirement Board v. Alton Railroad Co.
Date 1935
By a 5-4 vote the court struck down the Railroad Retirement Act which established pensions for railroad workers on the ground that it exceeded federal authority under the commerce clause.
So, clearly the Supreme Court is not tremendously eager to prevent Washington from centralizing power.
Today they decided that unions had to notify non-members when they were going to change fees and allow them to opt out of paying them. Good thing, right? Unions are private clubs. The federal gov't shouldn't be getting involved in them in the first place. I know this has been going on for generations; that doesn't make it right. There are tons of legislation involving unions. Not one syllable should have been written, certainly not at the federal level. Any justification would require a creative reinterpretation of the Constitution.
This is just the latest. There is a long list. It would be even more telling to weed through the cases the Court has refused to hear and analyze the trends that would bring up.. Fortunately for them, no one has that kind of time.