If a case is disqualified from reaching the supreme court based on the criterion of mootness, then it has been determined that

The answer is "the relevant facts have changed or the problem has been resolved by other means."

Mootness emerges when there is never again a genuine debate between the gatherings to a court case, and any decision by the court would have no real, practical affect. In the event that it is resolved that all issues for a situation being heard in a U.S. government court have turned out to be disputable, at that point the court must expel the case.