The shared setup has some significant limitations for a home user. It requires a dedicated 24/7 server, and it only works as long as the devices are on the same intranet. So it would not work for a home user at all unless the device never leaves the home and the network that the server is also hosted on. At present it is designed for use by schools who have carts of iPads under a managed deployment but not enough to give each student one full time.
I'd be surprised if Apple has not thought about this for both home, and enterprise deployments (the tech news sites and blogs certainly have since iOS 9.3 introduced shared iPads for education). But I'd imagine the Education system is the current test bed, and they need to work out how to simplify the storage, management and push of individual user profiles without requiring a dedicated server and admin for the system, and using a simplified managed deployment app.
Perhaps they could adapt something using iCloud and a shared user subscription service where the server & service admin would be handled by Apple for users. The crux of it is though that it's not as simple as flipping a setting on the iPad or installing a simple app. The deployment side and user profile management is somewhat complex and would typically, at the very least, be highly frustrating for the average home computer user.
All we users can do is wait and see what develops.