What's really turned them so silent is that they fear, or know, that this is a trend that will probably continue going forward. It probably won't be an every season thing, but it's very unlikely to regress back to how it was like the first few years when the B1G only got 1 team to the Frozen Four in those first 3 years and only 2 compared to the NCHC's 7 in the first 4 years. The NCHC started out with several advantages that helped it start out more successful, but were or are not the type of advantages that will help them sustain the success they had from 2014-2021 far into the future, at least not in my opinion.
On the other hand, the B1G started out with some disadvantages that just needed some time to overcome, and the advantages the B1G has, also needed time to kick in. Have those disadvantages all been overcome? Have all of those advantages fully kicked in? Is the recent trend(4 Frozen Four teams for the B1G compared to just 1 for the NCHC) going to continue and be an annual thing? I don't know for sure. I'm sure the NCHC will bounce back to some degree. If not as a whole, a couple teams or at least one team should have some good seasons going forward.
Comparing the 2 conferences future potential, I'd say the B1G's potential going forward is far better than the NCHC's.
Miami of Ohio? Omaha? WMU? CC? None of these schools have ever had more than a few really good seasons. All are small schools with no big time football or men's bb to help fund anything they want to do with their hockey program or their athletics dept in general. None of them have tons of money or a lot of alums with money to make things happen. What do these schools offer outside of playing in the NCHC? I'm not saying it's impossible that they could develop into legit powers, I mean UMD figured out how to do it, but I think UMD had an advantage that they don't have, that being located in the state of hockey and being close to Canada and also having a successful women's program as well as a successful football program that helped give the fans a taste of what it's like to have a championship team, but I am just saying it's unlikely.
Compare those 4 to the bottom of the B1G, OSU, Notre Dame & depending on when you are talking about, Michigan St and/or Wisconsin, both Wisconsin and Mich St have several Natl Titles and periods where they were considered a legit power and have the money to put towards their programs and have some mojo as well, or at least Wisconsin does, not sure about MSU? Notre Dame has had limited success in the past but like UW and MSU has the money to put towards their program. Will they? Not sure?
Now looking at the top of the 2 conferences, I think Minnesota, Michigan & PSU have the money and facilities and mojo and desire to win to the point that the 3 of them combined can match up with the top 4 of the NCHC, because as good as UND & Denver have been throughout history and UMD has been recently, all 3 of them, as well as SCSU are all smaller schools without big time football or men's bb to help their athletic depts in general. Not saying that is a requirement, but it sure helps and not having such can hurt.
Also, I think what UND had in the old WCHA wasn't replaced with what it gets in the NCHC. Series' with small schools such as Denver, CC, SCSU & UMD continued, which helped the new NCHC to start out well as the majority of the conference was made up of schools with heated rivalries, but instead of UND traveling to play Minnesota and Wisconsin in their big arenas and on their big TV networks, those series' were replaced with more small schools like WMU & Miami of Ohio which long term take some of the shine off of UND and DU, CC, SCSU & UMD who all benefited from that dynamic as well.
Meanwhile Minnesota and Wisconsin and Mich, MSU & OSU left behind the small schools to join up with each other and big school PSU and later semi-big school Notre Dame. This new combination of schools wasn't going to start out with a bang, it would take time for the rivalries to heat up and now they are heating up. And with the heat has come more fans showing up to games and watching on TV. TV mind you on the B1G conferences own network if not on other networks. And networks like ESPN or Fox, etc., are going to prefer to have games vs big schools with large potential fan bases like Minnesota, Wisconsin, Michigan, PSU & OSU on their networks. A casual hockey fan who tends to only or mostly watch the NHL might watch an NCAA tourney game between big schools like Minnesota vs Michigan or either of those vs a Boston College where as a game of schools like Mankato vs Omaha or St Cloud St vs Quinipiac isn't going to draw as many non-college hockey fans.
Now the difference may not be significant enough for networks and many or all of them may not even give a sh1t about college hockey? But if they ever do, it won't be because of anything the NCHC does or contributes to the sport, but it easily could be very much because of something the B1G did or contributed to the sport. Maybe helping to bring it into bigger markets. Many believe and have said that Arizona St started up only after they saw PSU make it work for them. The NHL stated it was open to helping a school like Illinois in getting started. If a West Coast Conference or the Southeastern Conference ever start up or move up to Div 1 play, it won't be so that their teams can play the likes of St Cloud St or Omaha or WMU or UMD, it will be so that they can play the likes of Minnesota, Michigan, OSU, PSU & Wisconsin in big arenas.