Maybe when the Apple Watch eventually becomes untethered. But it's a massive USP for the iPhone, the phones practically sell themselves following the release of the Apple Watch.
No one can argue that it's the best smart watch on the planet, it's crushing anything Android is doing, and it has become the best selling watch of all time period, so don't expect it to be untethered anytime soon as Apple clearly don't need to worry about bringing it over to Android just yet.