The Universe, as far as we know, is ever expanding so I would say as long as the Universe continues to expand, so can the American lifestyle, as long as we aren't acted upon by an opposing DUmmie force.
Compared with the wealth available in the Universe, we are all living like pikers. But, in our defense, we can only be as wealthy as we believe we can. And most of us have never even set foot off this planet. So, what the hell could we possibly know?
Mere babes in the woods is all we are. But give us a little time and we'll even be able to cure DUmmie-ism. Just have a little faith.
Oh yeah, never forget, tomorrow's needs will be met by tomorrow's resources. So, enjoy today! I know I am.