If your utopia requires changing the laws of physics or human nature, as Star Trek's society would, then it can't happen.
Maybe we can get a lot closer than we are now (I hope so) but the part where people evolve beyond their "base instincts and vices" and choose to work as though they lived in a capitalist society, just without caring about personal gain, is a fantasy.
Maybe we can get a lot closer than we are now (I hope so) but the part where people evolve beyond their "base instincts and vices" and choose to work as though they lived in a capitalist society, just without caring about personal gain, is a fantasy.