I like NBC's commitment to the league a lot, they do a very good job with the broadcasts, but their on-air personalities are garbage. At best they're totally unremarkable (Keith Jones, Anson Carter) and at their worst they're absolutely terrible at their jobs (Mike Milbury, Jeremy Roenick).
And that might be a hockey thing, but it might also be an NBC thing: It's a company afraid to commit to anything other than the most milquetoast, inoffensive people (see: a million years of Jay Leno, Jimmy Fallon, their never-ending recycling of mediocre SNL personalities).
So, I wouldn't mind them moving over to ESPN or some other outlet capable of finding and developing engaging talent. I know, some of their morning blowhards are completely insufferable, but for every Steven A. Smith there's a Rachel Nichols.
On a larger level, the NHL is the only one of the big four with an exclusive deal. I gotta think that stymies its growth somewhat. Getting it on more platforms is a good thing from an exposure standpoint, you don't have to pay to advertise the playoffs on other networks if that network is also broadcasting it. You'll get the cross-promo ads in-game during other sporting events, all that...just more exposure.