Well, isn't this actually just the thing Nokia did with N9? When you use it without developer mode and with deault settings (only install from the store) you get the everymans/womans phone with nice GUI & installable safe apps. With N9 you get most of the important bits as source, there are lots of stuff that's NOT opened and that's an annoyance but really, you get the important stuff on a DVD just by asking for it, no need to pay even for the cost of the media&shipping (For which they COULD actually charge you for, according to the open source licencing...)