I wonder if it"s going to be possible for some enterprising soul to come out with a case for the R-Pi that also includes a 4 to 7 port USB2 hub with internal USB cabling to provide micro-USB power (1A, or maybe just 500ma) for the R-Pi and a single USB data connection back to the hub from the R-Pi. Expose the remaining 4+ USB ports on the top or side of the case.
One power adapter (>1A output, of course) would be all that"s needed to power the hub, R-Pi and also any connected USB devices (at 500ma, although 1A would be nice on all USB sockets, or maybe even just a limited number of special "high current" sockets).
Buy the "hub case" and associated PSU, drop in your own Model A or Model B R-Pi board, connect up the two cables, close the case – job done.
Or am I dreaming?