Center Ice is an NHL product. So, even if Dish doesn't carry some RSN's for their regular subs, some type of deal should be in place between the teams and NHL to include those broadcasts in CI, regardless of the standard carrier carriage contracts.
They do carry those broadcasts ... in SD. People want HD and are speaking of that. To be fair, I see their complaint. I was watching the Kings vs. Oilers last week. I started in my bedroom watching the SD TSN broadcast on my SD TV. When I moved out to my living room on my HD TV, I had to finish game on FOX Sports West, because the picture on TSN was awful on my HD screen.