I'm not saying it's something that people shouldn't think about or have some concern over, but many were saying the same exact thing about Wal-Mart in the 90s/early 2000s. Today, Wal-Mart is largely an afterthought. It is very tough to stay on top for a long time when everybody else is trying to compete with you in a thousand different areas. Think about how Apple was on top of the world and seemed to be very dominant a very short time ago and think about today how they seem to be behind on so many critical technologies. Times change. Big organizations get overconfident, pozzed up with bad employees, and can't move as fast as more nimble competitors.