I think every Apple derivative product built since the iPhone is proof they don’t need to reinvent the initial market conditions of the iphone to yield high ROI. Half of Apples success is just understanding their own customer base and building a car for them. If you are in this group you already know it (i am). You could say at least 10% of existing US car owners would already own one if it existed. Apple just needs to show up and build a car for them and its sold. Same is true for headphones. For TVs. Etc. it is all coming.