Outside of discussing 18th-century language, do you really believe Americans are going to turn over their guns because a politician comes along and says we have been misinterpreting it thus we must all turn in our guns?
It would be naive to think that any change to US law with regards to guns will change anything overnight but we have to start somewhere and allow for the culture around gun ownership to change over time.
As an American I don't need a legal precedent to say I can own certain property, a legal precedent needs to be set to say I can't own certain property.