Many say that this is precisely why automotive companies have been postponing the move to electric. A lot of the reason for major auto companies existence is that it used to take sophisticated multi-billion dollar organizations to design and manufacture high quality ICE engines.

Overall, "anyone can make an electric car" is bad for the incumbents. China has hundreds of electric car companies turning out surprisingly decent vehicles that are probably good enough for most of the world. The vacuum company Dyson is getting into electric cars.

Everything but the powertrain (including almost all of the safety technology from seats and airbags to sensors and driver assistance) is available from suppliers, so it really isn't out of the question for more new brands to disrupt the industry.