I think society should have a few dreamers. But there are two problems:
- There are way, way more applicants for the job than there are openings.
- Even for blue-sky dreaming, there should be some attempt to separate dreams from fantasy and sheer craziness. The time and whatever resources were devoted to trying to spin straw into gold were a complete waste.
I think Elon Musk is not a dreamer but a BS artist. Here's a seemingly careful attempt to support that thesis.