Seriously, we can do 25.5W on 802.at-2009 NOW. Some vendors are doing 51W by using all 4 pairs.
Yes, I know many of you have laptops that draw almost 200 watts, but most of us don't need over 50W most of the time. If properly designed, the laptop can just "tread water" by slowing or stopping battery drain while drawing 51W during a work session, and then recharge while you're eating lunch or surfing Slashdot.
Imagine hooking your laptop up to power and ethernet at the same time! Single connection, less real estate used up on the exterior.
Just configure the laptop to draw power over the ethernet port, and not only do you not have to worry about a AC to DC brick, but you can travel the world and not have to worry about all the forms of AC power.