I like to take it a step further. If you disconnect, you should be banned from play for 10 min.
Most of the *ahem* "real excuses" that I hear are phone calls, bathroom, food, need to leave for errands, ETC - OK so a 10 min ban wouldn't really affect those people anyway. For those that quit only because things aren't going their way, IMO they should sit on the bench for 10... --- "Pretty Women Make Us Buy Beer. Ugly Women Make Us DRINK BEER!" - Al Bundy (12/14/2010 = All time Worst Patch in the History of Gaming!)
If you disconnect, you have to write a 500 page essay on your choice of topics from the following list:
Why all recent MMOs have failed to kill WoW Why the language is so foul on Xbox Live Why the bread always lands butter side down Why my left sock disappears in the dryer. What you would do in case of a zombie outbreak --- It's like walking up to a girl you really like, going in for a kiss, only to get a casual punch to the face before the kiss. - Notch