The lesson of Tesla is that you can produce really cool things if you can throw a ton of money away up front and wave your hands around vulnerability to established competitors. In this respect the conservative approach of existing manufacturers towards electrics looks much more prudent than Tesla's high risk approach.
Tesla is in a very good position in the market. They have a hot product, visionary leadership, good funding, and political tailwinds.
TL;DR - I think Elon will do just fine.