I think I'm too olde to roll fixed gear bikes on a daily basis. On a recent trip from Vancouver, WA to Olympia, WA I frayed my front derailleur cable, rode for 90 miles in the 42 ring, and have since popped a 44T on there and gotten rid of my big ring and front derailleur. One fewer derailleurs is nice, but I don't think I can do away with the 8 gears in the back.... or the freewheel.
I <3 simplicity, but gotta get up the hills somehow.