Some warnings about a docking station:

Historically when a docking station is made an optional accessory, it is then priced too expensive and few people buy it. The exception is when the device then becomes so popular (i.e.: iPod) that there are lots of 3rd parties making low cost docks for it.

If too much functionality is transfered to the dock, then one starts to feel they must carry the dock around with them too. It kind of ruins the portability of the device.

I like the idea of lots of single-purpose USB accessories instead. You take what ever single accessory you need for the task with you at any time. This would typically mean "no accessories".