Viacom pulled the rights to broadcast the channels, not the other way around. The two sides have stated that the other is the problem.
Dish says that Viacom is looking for a rate increase 4x the rate of inflation. It also has been reported that Viacom is trying to make Dish carry Nicktoons. Dish says Nicktoons will add nothing to their line up, except cost. Viacom says that Americans spend 20% of their TV watching time watching Viacom stations and the increase they are looking for is reasonable.
I for one appreciate Dish Network holding out and showing that Viacom is not as important as they think. I will miss recording the local CBS station on my Dish PVR, but I can watch them on my terrestrial HDTV tuner. The channels my household will miss most are the Nickelodeon channels. I guess, they kids will have to watch more Disney channels during their TV time.
CNN tried a similar thing with Dish and backed off. They were trying to get a large rate increase while their viewership had dropped 34% over the same period.
Dish says this is how they control increases to their customers. Their customers will receive a $1/ month credit for local channel loss and $1 for MTV loss for the length of the dispute.
Best Regards.