I don't think an Olympic Gold for Michelle Kwan will make any difference to figureskating. I think figureskating is just going through an unpopular period which could be due to the judging scandals and also lack of sensational news.
As far as Michelle winning the gold in 2006, personally, I will just shrug and think "it's about time"! I don't believe an Olympic Gold will make Michelle nor figureskating more popular. Also Michelle has stated in the past that she does not want to skate in shows. So, even if she does win Olympic gold, will she skate professionally on tour?