Do you want to see nothing but Penguins, Red Wings, and Blackhawks games? They get the most games as it stands, but bring in fan voting and they'd get all of the games.
Fan voting is always a disaster. The fans aren't going to vote for the best rivalry that week, they'll vote for the game that involves their team.
Good on NBCSN for this...I'd like to see more real rivalries on these Wednesday games, but hey if the fans are interested in it then that's fine with me. It'd get boring watching the same couple rivalries on a rotated basis anyway, I like to see some rivalries of the past spotlighted as long as the network is able to explain why teams were once rivals. This new show should help aid them in doing that.
The Top 10 thing could be interesting if it's anything similar to what the NFL Network (or to a lesser degree, the MLB Network) did. Those countdowns are always entertaining, especially if they're able to put together a good panel. NBCSN should be able to get way better commentators than the shoestring budget NHL Network could.