Though your post was probably downvoted for its unrealistic pessimism, I have to agree with the idea that much of humanity's labor is wasted. The question remains, however, what do people do with their time, and how do they feed themselves, when their labor is entirely replaced by machines?
That is the zillion dollar question right there. We're facing it now and it's only going to get worse.
The economic system we have in place now seems like it breaks down when a portion of your population cannot join the workforce in any sort of useful fashion.
I don't think you can solve this problem with the current ideologies of the common American. It goes against the "core values" of many Americans so any attempt to change the system will be met with much opposition.