I just can't imagine Apple entering such a low-margin business like automotive.
Apple's car wouldn't be low margin.
But it does seem implausible that they could charge significantly more for a car than the high end competition, so then how would they make it better and reasonably profitable at a competitive price? That's the key to whether they will or won't.
The other thing to remember is that while the profit margin on a car is a lot less than on what Apple makes now, if they made $10k per car and sold hundreds of thousands that still adds up to a lot of real money.