Here's an interesting prediction by Marc Faber. I took a quick look and Tesla's market cap is $33.49 Billion but their total equity is $2.5 Billion. I'd say their shares are overvalued but I doubt it'll go to $0.
http://www.cnbc.com/2016/08/09/marc-faber-tesla-shares-are-going-to-0.html
Beautiful post