I've said this many times, with the counter argument being that it would make the match much longer. The response to that is simply - WHY?
When players realise it's their own time they're wasting, they'll stop doing it. They've still got to play 90 minutes football, and, as highly paid professional athletes, that shouldn't be too difficult. The main problem (not to City) is that it would highlight the inadequacies of many teams and their management, whose sole objective is to stay on the gravy train that is the Premier League by any means possible. If this means by timewasting, feigning injury (playacting/cheating), roughhouse tactics, etc, then so be it. The cry that they don't make as much as the top teams and have to play that way for their survival, is misleading, as all bar bottom team Sheffield United last season earned over £100m from the PL alone.
A breakout of common sense will never happen, of course, as there are too many vested interests in maintaining the status quo, but that is for another thread.