I think the KDE view point may be the better for this space. The mobile-tablet space is going to become the mobile-tablet-washing machine space and having a widget set which allows producers to customize for their washing machine or refrigerator or car navigation system is going to be the bigger draw for companies not wanting to be in the standard market duopoly.
One thing I would like to point out is that HTML/HTTP has replaced A lot. We need to be very careful about the "where is my flying car?" viewpoint we technologists get caught up in. So the Web didn't replace everything people said it was going to in 1995. It has become the bottom structure for so many other things that it is hard not to see where some new service is really just an HTTP server morphed a bit, and its data being sent is just HTML without some of the eye candy.