There is nothing "the economy" can do to change that, though. Feeling meaningful and full is a state of mind. And that goes more in the realm of religion and spirituality (and psychology) than materialism. It cannot be changed by any government intervention.
Some people have confused those things to the point of extremity. To take an extreme example on the other side, buddhist monks feel fine about themselves without being "productive" and hardly having any possessions.
Also, "useless" is very cruel thing to say regarding people. Who decides who is "useful" and "useless"? Can't we just as well say "everyone is useful" to make people feel better?