Their docking solution is their thunderbolt display. When I go home, I plug in 2 cables (thunderbolt & power) and I've got everything connected.
Their thunderbolt ethernet adapter is $30: http://store.apple.com/us/product/MD463ZM/A
Their thunderbolt ethernet adapter is $30: http://store.apple.com/us/product/MD463ZM/A
Even when setting up hotdesks for guests, it's unclear if you could put just a TB display in them -- enough people will have non-TB macs, or non-macs, to require something else. Maybe you could have some percentage TB display, but a good third-party dock + a display which can take multiple inputs (DVI, HDMI, MDP via adapter, TB to adapter to monitor) seems like a better choice. Uglier, yes.
For personal/home use in a dark room with only 2011+ macs, and if you have a spare 15" for other temporary use, then sure, it's a good option.