The Heller decision was a re-writing by the court of all previous interpretations of whether the second amendment conferred a personal right.

A similar decision could completely undo it, because again, its not a codified law - just a decision throwing out a DC statute.

Until an Act of congress defines things more narrowly,we would expect to see statutory laws unduly restricting access for home defense thrown out.

An act of congress could entirely change that, just like the Heller decision threw out all existing precedent.

So yes, a law could be passed and brought before the court which leads to yet another reinterpretation of the 2a and disregard for precedent, including Heller.

A friendly reminder there were dozens of court rulings on the 2a before Heller with far different results, and there will continue to be due to the antiquated and vague wording of the amendment.