Sounds pretty interesting to me, tbh. It's not a perfect solution, but it's got a lot of good points going for it. I personally would still take a desktop + netbook, but this is getting closer to a workable balance of portability on the move, power at home, and convenience of not having to synch many devices.
Until we get reliable high speed mobile internet so we can start storing all our apps and data in "the cloud" (i.e. no additional synching required), there'll remain some kind of market for dockable portable computing...