Not everyone wants a massive desktop box under/on their desk. Apple achieves similar things with their Mac Mini and iMac. I think this is a good move, also could make for a living room appliance for music, movies.. etc.
My thoughts exactly, I'd be more excited when my usage wouldn't mean a $300/mth data surcharge. The phone is "old" after a year or two anyways, and there will always be something else to look forward to. Even @ 2 years, a $500 phone costs about $20/mth after which point you can probably ditch for $50-$100. The usage is where they make all the money. :)