I'd second the agreement. The Series 3, in some form, makes perfect sense to keep around. It sold like crazy during last Black Friday, is an excellent low-cost entry into the Apple Watch world, and is still a very useful and functional device. But importantly for Apple, it is clearly a step down from the newer models (4, 5, 6), so it would cannibalize fewer Series 6 sales than a re-released 4 or continued 5 would if sold alongside the 6.