I can't think of a worse disaster. Tesla has spent years working on their OS, working out the kinks, improving it. Then Apple comes in, puts in Apple OS, an OS not made to drive cars, and ships off production to China to a company that uses slave labour. Yeah. That'll work out well. Watch how fast I cancel my reservation.Apple has billions of dollars of cash, just sitting in non productive assets.
Tesla has perhaps the worlds best cars, but needs billions of dollars to further develop them and invest in production facilities.
Might make all the sense in the world for Apple to just buy Tesla, and retain Musk to run it. Everybody wins...a lot.