It's funny...a lot of the professional poker players complain about other players that take way too much time to make decisions, when the funny thing is it is in the players' power to control how long their opponents can take for decisions (ie, calling the clock on someone), but very few people do it because it is considered bad etiquette.
So from that point of view, what more are the players asking for? A forced shot clock, where the tournament director never lets a person make a decision longer than, say, 4 minutes? Maybe. I think the biggest thing that needs to change is the nature of "calling the clock". If it can get through to the poker community that calling the clock on someone isn't considered bad etiquette, then I would think a lot more people would be comfortable calling the clock on someone who is taking 4 minutes or more to make a decision.