Earlier quoted context omitted.
Apple already sells a Thunderbolt docking station, with a very nice 27" display built in.
Personally I think baking the GPU power into the displays themselves is the more Apple-y approach. As opposed to some sort of additional-stackable-boxes solution. (Which I'd love to see; I just don't see Apple doing it.)
I don't agree.
Any Monitor with built in GPU won't make sense with the new Mac Pro, which (I think) will be the driving force for the new (likely 4K) Thunderbolt cinema displays.