Tesla cars are not going to remain the top car in the vehicle stock market always, although it was making the news about all that was and is of electric cars. The minute Elon Musk introduced the Model S to the streets it proved Tesla battery-powered vehicles were not going to remain bound to the vicinity of the automobile industry. If you are someone who wants to invest in a Tesla stock for the long term, be aware of the problems that can result from not diversifying stocks.