Well, the Supreme Court has no executive powers of its own, so technically, it can rule on cases from now till St. Swithin's Day, and if the other branches -- or The People -- refuse to observe its dictates, it is powerless to enforce them.
Then WHY doen't President Bush and the US Congress tell the USSC to PACK SAND!?!
While SCOTUS may be powerless to enforce its decisions, the People and other parts of government has bound themselves up by taking the "Rule of Law" to the extreme. Whatever the courts want, they simply dream up a new constitutional right, such as abortion.