The amount of whine in this thread is really amazing. So what if you get locked out for 30 minutes from using the DF? If you were able to reject the queue three times in a row I doubt that 30 min makes that much of a difference. All your real life emergencies that suddenly spring up on you will most likely occupy you for more than 30 min anyway so don't sprout that poor excuse.
All this whining about "oh but i only have 2 hours a day to play"....if you only have 2 hours you most likely spend the time in queue anyway and not commencing will not be a problem that frequently occurs.

Tough luck if you are a poor innocent soul that got hit by the punishment because some idiot in your party is to stupid to commence. If that happens three times in a row I would seriously start questioning why you are pairing up with such people.....and for all other purposes there is that nice tool called ready check....use it. yeah it sucks if you are innocent and are locked out from DF (for only a freaking 30 minutes)....but so is being paired with a crappy tank in a dungeon....the options that you have though are the same...either you deal with it or you leave the group.

I am amazed by all those hypothetical cases you people come up with of why this is unfair and whatnot...if you have serious bladder issues that makes you run to the toilet every 5 minutes so that you miss every damn queue you ever signed up for....get a bucket or don't queue in the first place. If nature calls your booty back to the toilet and you miss your queue then at least the next queue should be a safe bet unless you peed 6 liters and are in serious need of rehydration.

Seriously though, if all day long you are fine and then suddenly, every day, during those 2 hours of playtime you are hit with explosive diarrhea, incredible thirst, family emergency cause you need to exorcise your little sister, etc, pp....I would start thinking whether you should start up the game in the first place.