I don't think Elon will stick around long term at Tesla.
The goal for Tesla is to accelerate transition to electric vehicles. Once that is completed Elon will move on to another project similarly to when he transitioned from X.com/Paypal to something else.
You mean that's the mission the want to sell. I mean, can you tell me of even one company that states their mission is 'increase the share value'? Or even something close to that?
I think the hyperloop is even more ludicrous given the technological problems involved in vacuum tubes. But I think Elon realises that which is why all he did is write a memo on it rather than create a company around it.