MacBook dock system, a new apple patent

it is a funny idea.
it might attract some people to buy it.

the scenario can be like this:

we have a slim-laptop, you can carry it very easily on the way, work in the train, coffee shop...
on the other hand, you can workk very comfortably with your big display at home. you won't have any problem with sync all you files...

HOWEVER, we can do it easily with our monitor-out cable NOW. why do we need a dock monitor??? or does it have any other functions? if not, I doubt, weather this idea can work or not.