The great thing about Apple is that you never know what industry they're going to reinvent next. They solve problems that we never realized were problems, and find solutions that are clever, practical, elegant, and obvious in retrospect.
Apple Car rumors are exciting because there are so many flaws with the current automobile market, but nothing is ever going to change unless a new company comes along and does something new and exciting that forces all the current automakers to take notice. But it'll take more than great ideas and engineering to change the 100 year old, multi-trillion dollar automobile industry - you also need a crazy amount of financial resources. And it just so happens that Apple is currently one of the most valuable companies in history.