That's what I do now (except for the dock, I just plug everything in) but if I had one of these I could save: (a) on buying a separate keyboard and (b) on desk space.
OK, it's not a huge advantage, but it's neat.
Only downside: unless they're very clever with the design, a brick-keyboard isn't as good to type on as a regular keyboard. But hey, maybe they'll be clever with the design, so it tilts downwards properly.
Hmm, and I just thought of another nice way to use it: on my lap, on the couch, plugged into my big-ass TV.