I also think that touch screen keyboards are crippling, but it seems that most non techies don't type fast enough to care anyway. So maybe keyboards will end up being a specialist tool?
Add every secretary and administrative assistant to that list. The big volume typing problem with touch screens (other than the constant "shifting" to get other keys (e.g. Numbers on the iPad)) is the lack of movement which results in more stress on the fingertips. Not to mention the lack of contours to tell where fingers should be placed.
I do think it might be interesting to allow the word prediction to be system wide on desktops / portables.
For me the biggest factors are the lack of physical response (although the mini vibe on Android helps here), and the way touch screens can get overloaded if you type too fast. On my keyboard I can type hella fast, but if I tried typing like that on a full size touch keyboard, even if I hit every key perfectly, the touch screen would get overloaded and miss letters.
