10 years?
it hasn't even been a month boy and the shirtstorm has arrived
https://www.cnbc.com/2017/10/25/tesla-firings-spread-across-solarcity-employees-blindsided.html
Also although it should be legit to say 5-10 years given the fact that the companies just started, no, I give it tops 1 since this post was written to all come down. I will keep posting the news here for your convenience.
3 months later Tesla stock has bounced back, The Economist runs articles about SpaceX and the upcoming BFR and on the streets of Luxembourg I see more and more Model S black taxis while a new Tesla Model X SUV seems to be replacing a Porsche Cayenne in front of a new house every week. Tesla might well be the product of a collective dellusion (a bit like religions) but that doesn't spell doom for it ... at least not for the next 2000 years ...