I fly frequently and have often thought about the same thing. That plan would probably end badly for you legally, regardless of how morally right it is.
Some time ago wasn't there a case where something similar happened and a passenger made a cell call to his lawyer who got a judge to order the plane back to the gate? I don't have a lawyer myself, but I've always thought I could call my wife and then have her call all the local media, the airline and the airport authority and make a big stink out of it. "My husband and all these other nice people are being held hostage!"
I was recently in Yuma and that included a short hop from Phoenix. Americal West announced the plane would be delayed 3 hours. I could rent a car and drive in that time. Figuring the plane would never go, i.e. be completely cancelled I asked for my checked baggage back. Got it back in 15 minutes, no fuss, no muss. I was worried they would hold that hostage! BTW, avoid America West if you can, they are totally screwed up right now during their acquisition by US Airways.