Beyond the expected comments about Tesla being the iPod of the auto industry, I personally feel like these types of valuations during the beginning of an economical slowdown can be judged by the duck test. If it looks like a bubble, and sounds like a bubble, it will probably pop like a bubble. Unfortunately, most of the time this opinion will be grouped together with "Tesla haters", of which I'm definitely not one. I love Tesla and I want them to succeed, but runaway valuations based on hopes and dreams are normal in a bubble, and when you look around I see a lot more factors saying "yes" than those saying "no" when I wonder if this is another tech bubble or not. When valuations will level out though, noone knows.
What makes you think it is runaway valuation? And could that same reasoning be applied to Google, Amazon, Apple if we go back in time when they were just finding their footing?
As someone who drives a model 3 on autopilot everyday I would say the stock is rather underpriced.