We can all offer our armchair theories about Tesla's actual worth, but until traders start to move en masse, that is what it is worth right now.
I think you are asking a different question: will Tesla be more profitable than the other 10 manufacturers in the long run? Because right now they are not. Personally. I don't think they will ever scale to a commodity car as long as Elon is at the helm. I don't think he has the attention span to make a mass produced car, his ego likes doing something novel and he likes luxury. To make profit like the top 10, Tesla has to become a commoner car. I don't think he can pull off an iPhone move, Tesla may always just be a Mac.