"I've thought a lot about it, but I don't have a strong opinion. The idea of a space force is not fundamentally odd when you consider that the Army, 70 years ago, birthed the Air Force. There was the Army Air Force. And once we realized that technology and war-fighting capabilities evolve [and were going to take place up] in the air space rather in the ground space, then it was sensible to suggest that perhaps this should be an entire branch of the military unto itself. We as a nation have assets in space of incalculable value. And so when you think about what a military does, as a minimum they would protect a nation's interests and a nation's assets, so, it's not a weird idea to say we perhaps should have a Space Force." - Neil Degrasse Tyson
But you're totally right.. literally NOBODY takes it seriously.