Price Point hold back
Microsoft has already accomplished the OS across all devices. However the Surface Pro 4 consolidates desktop, laptop, and tablet into one device using a docking station with dual monitors, particularly applicable to the mobile worker with an office (home or business). The primary drawback is price. The price point for a business class Surface Pro 4 (iSeries processor, max ram, max disk) is not acceptable to the average consumer. Both Lenovo and Acer now offer favorable Surface Pro alternatives at a somewhat better price point while HP and Dell are just as costly as Microsoft. At the business level these detachable tablets are going to be more and more popular. The consumer market will be a harder market to crack for such Windows devices for most of the same reasons as in the past. The Windows Store and Windows Apps still suck.