I don't know much about the Hyperloop - I was never interested in it, and it never seemed like a real project, some kind of Musk BS probably, but I don't know enough to debate it. Full Autonomous driving is definitely also a very ambitious project. I do think it is in principle feasible, and has great potential, but also serious possible obstacles. I think it's worth pursuing to figure it out. I would say that selling it to the mass market is premature at this point, and has been overhyped by Musk a lot. Also don't know anything about the Human/Robot AI program, that also sounds like Musk BS, so I don't really follow it.
I do think Musk is a narcissist, I don't think he is an idiot. I don't think calling him a con-man is really justified. I also don't think he is a genius, more like someone with decent amount of technical competence who often unreasonably clings to slightly insane visions and an ability to assemble talented people and push them to try to execute on those visions and ideas, which sometimes leads to legitimate breakthroughs, for example in case of SpaceX.
I would never take Musk's predictions, economic or technological at face value, he is clearly always talking far ahead of anything currently happening, an his predictions are notoriously unreliable and wildly optimistic. I don't think that takes away much from the actual achievements of both Tesla and especially SpaceX however.
I also personally would never buy a Tesla, for a variety of reasons - I actually have a lot of disagreements with the Tesla philosophy, and will probably never own a self-driving car either, but whatever.