I don't think Apple would necessarily have to build their own cars from scratch or solve the alternative fuel issue or deliver a self-driving car to have a sign

I don't think Apple would necessarily have to build their own cars from scratch or solve the alternative fuel issue or deliver a self-driving car to have a significant impact on the automobile industry. For example, I would personally love a Subaru that had its information and entertainment systems designed and built by Apple and licensed to Subaru. It would also be cool if Apple's designers helped with the overall exterior and interior design.