But smartphones are also clearly not going to crash and burn. Even if people don't replace them like clockwork every year or two years, there is going to be a healthy market for iPhones for a long, long time. There are still people without smartphones, there are still large markets with low Apple penetration, and they have an enormous install base and developer support -- and, as you say, positively absurd profits to cut into eventually.
Does Apple dream of another product that will be as big as the iPhone, but is yet in its infancy, with its growth ahead of it instead of behind? Well, of course they do. How could they not? Will they launch new products? Of course they will. Might one of them be a car? It might. If the stars align for Apple again, might we in ten years say that they are not the iPhone company, but rather the X company? Yes, that is possible.
But:
1. There is no possibility that Apple is planning to pivot in any meaningful sense of the word. "Pivot" does not mean "launch a new product and hope it takes off." Pivoting is simply not something that the most valuable company in the world does in the face of some cooling of demand. Pivoting is what desperate start-ups do.
2. If the leaders of Apple are basically cool-headed people who do not entirely buy some kind of superheroic mythology of what Apple is capable of, they are probably aware that the iPhone was a literally singularly successful product in the history of, like, the world, and that the odds that lightning will strike twice and they will have another product that successful or even more successful are lower than the odds of lightning literally striking the same person twice. It is possible that Steve Jobs was not a basically cool-headed person. I think that Apple's current leadership is.
3. And specifically, the product that makes us forget the iPhone just straight up can't be a car. There is just no demand for a car that can support an Apple-in-2015 type valuation, especially at iPhone-like profit margins, double-especially in a world in which autonomous cars makes any meaningful jump in the utilization of each car. And PS: approximately 0% of Apple's current employee base would be useful in Apple-as-a-car-company.