So you have no evidence beyond fantasy that this would happen. Good to know,
I don't need to show you where it has been.
If Obama replaces the aforementioned conservative judges who were in the majority of those opinions with typical views of liberalism and textualism, stare decisis will not be emphasised, and gun control laws will not be reversed.
If practicality and how these judges issue rulings is something that you will continue to ignore, then be my guest, historical significance of overturning is moot to those sitting judges without respect for precedence, as has been seen in the more recent Texas sodomy law case. There is no reason to believe that replacing Kennedy, Thomas, or Scalia, with a similar type of Ginsburg, Breyer, Kagan, or Sotomayor, will result in the same ruling as Heller. If you believe this to be the case, and they would rule the same as Heller, you need more studying the way judges interpret law. I'm not even a lawyer and I see this quite clearly.
I am quite aware of how judges interpret law. You... not so much.
Unlike you I am a lawyer and specialized in constitutional law academically (both degrees) and in practise.
You are a perfect example of the old maxim that a little knowledge (and as you have so clearly demonstrated so very little knowledge on this subject) is a dangerous thing.
As always lighting the path for the uninformed.