Sorry, that's not how it works.
A US District judge voided the bill. His ruling is only enforceable in his specific district.
Judges in other districts may use his ruling as a precedent for their own rulings, but his ruling isn't binding outside his district.
If the federal government appeals (and I presume they will), then the Circuit Court of Appeals will rule. If they reaffirm the ruling, then the scope expands to that circuit (I believe there are 10 in the country).
Whoever loses in the Court of Appeals can then appeal to the US Supreme Court. But, the Court rarely takes a case unless there are conflicting rulings among the US Circuit Courts.
Since other courts have affirmed Obamacare, the potential for conflict exists. But, until it bubbles up to the Circuit Courts, the Supreme Court probably won't consider it.
You are correct. The USSC will not take the case until the various Circuit Courts of Appeals weigh in. Moreover, the Obama justice department does NOT want a fast track to the USSC - they will do everything they can to kick this past the 2012 election - further hoping that they can induce Justice Kennedy to retire or another conservative justice to drop dead.
This one is for keeps, folks.