What do you mean they don't exist anymore? That's a bit fatalist. Hololens is still a very new thing. Mobile does have a small marketplace, but still a few millions there. IOT Core is niche indeed, but as the "internet of things" world keeps growing, it might grow too. Though the market is a different one. And band... There still are the remaining ones although I don't really know much about band. There is still a chance for future bands next year, though no way to know, that's true. Of course the main target is desktop+mobile ,and apps that work well with this duality are pretty cool, and more are still coming out.