This really is an audacious proposal and will be an awesome tool if they pull it off. For now there is still a long way to go. There is no command for upgrading a package version yet for example; in fact, when I looked at this a month ago, if you force it to install a newer package version without uninstalling the old one first, it simply seems to forget the old one ever existed and leaves associated files behind. Hopefully a lot of this will be ironed out by the time Windows 10 is released.