Toyota or General Electric are reasonable comparisons, both around 10x Telsa:

  TSLA	Tesla Motors Inc	182.14	-1.42	-0.77%		 22.13B
  TM	Toyota Motor Corp...	129.95	-0.29	-0.22%		205.93B
  GE	General Electric ...	24.30	-0.06	-0.23%		247.50B

Of course many slips are possible along the way - not least that Musk could get "hit by a bus".

GE is not a bad comparison: founded by Edison, based on electricity, created power station infrastructure...