No, the meaning of the phrase "living beyond one's means" doesn't go to the unavoidable fact that circumstances change over time. I will one day become infirm and unable to earn money, that does not mean I'm currently living beyond my means.
US dollars might one day cease to be the global reserve currency in which case Americans will not see such benefits associated with that. This is a true statement. That doesn't mean they are currently living beyond their means either though.
US dollars might one day cease to be the global reserve currency in which case Americans will not see such benefits associated with that. This is a true statement. That doesn't mean they are currently living beyond their means either though.