I think building app platforms is a start. I think handhelds need more to entice people to just have it around. Pick a few things that they can do better than phones besides gaming (these could even be new software markets hinged on specialized hardware). Something to differentiate. I think the general contract phone's days are coming to an end so sometime soon it'll just be connected hardware and different hardware has different strengths and weaknesses. I think just gaming isn't super viable though, there's an expected baseline.