The salary cap is clearly a big factor contributing to this phenomenon. Dallas wants to win again. And they need to make room under the cap if they are going to put together a team that can do it for them. But teams aren't built the way they used to be. If you look at the trends, particularly in free agency signings and trade deadline moves, you see teams building for single playoff runs at a time. We likely won't see many, if any, more dynasties like the Canadians of the 50s, the Canadians of the 70s, the Islanders of the 80s or the Oilers of the 80s. Instead, we get teams like Tampa, Carolina, or Anaheim popping up from nowhere to win a Cup and then promptly returning to the bottom of their conference standings the following year.