I'm only to read this article as it's very interesting topic and from the first look a nice discussion took place.

But answer for this is simple. You forget S^4 will be completely rewritten using QT. It will be something like light version of MeeGo at first for non high-end phones at the market at first. Later,probably MeeGo would be used on phones in almost all price range. But we have to wait to see=)