All I can say is that I must be an "I can't" guy as I can't see the average US household, which makes less than $60,000, saving $57,000+ per year and getting a full 10% from it because they "want to".
So, all that I can conclude that the people who subscribe to this mean something other than "average US" and must mean "average ATOT" or something like that. This is not to mention that if every "average" US household tried (i.e. wanted to), the economy would tank like a rock and they would all end up more poor than when they started, but that's another thread.
You're definitely an I can't guy, because you assume these average people, who start out average, won't increase their income to meet the goal. Yes, you're an I can't guy.
No one gets rich by being average. But, like I said, an average family can increase their wealth if they choose to. Most won't.