Your point makes sense, and it also doesn't. UConn has basically had a standing invitation to Hockey East for a long time, but (admittedly under the former AD) invested absolutely nothing in the program. In fact, in a somewhat recent review of the needs of each individual program's needs, the hockey program was listed as, in so many words, not needing anything more. Coach Marshall has been around forever and has one of the worst records in the nation. Freitas is a woeful D1 facility and does not satisfy HE's 5k capacity for all new members, instituted after UVM's admission.
You listed every bad team in the CCHA and WCHA that the B1G teams play. These interesting histories, Lake State has two national titles, NMU has a title, and Tech has three titles. Granted MTU's are from the 70's and before, and Lake State and Northern haven't won since the '90s, those were VERY legitimate programs when the CCHA was created, and back in the early days of the WCHA, Tech was a major player.
What you have to realize is that the rationale among hockey programs is not the same as in other sports, college hockey programs, coaches, and fans are very, very weird, and VERY much self-centered traditionalists. The B1G schools don't even want to be in the same conference as each other! So these somewhat has-been programs are long time opponents, so they like to keep that tradition. Secondly, the reason your super conference scenario never occurred in the past is it would've meant the demise of MANY college hockey programs. If the 5 B1G's paired off with DU, CC, NoDak, Duluth, and one or two others, maybe ND, the remaining schools likely would not be able to survive. As it stands now, many programs are on life support including former national champion Bowling Green. The creation of the B1G may end up causing the disbanding of a few more programs who can't make it without playing in a conference with the big boys to be able to recruit, sell tickets, and maintain the program.
So to loop back around to UConn, were we to join the B1G, yes, the other schools would not like that from a hockey perspective. UConn would have to pour LOTS of money into the program, build a new arena, get a new coach, and upgrade quickly in a conference where they'd be so overmatched, it'd be sad to watch on the ice. I 100% guarantee you fans of the other programs would hate the idea of UConn joining in hockey. As for the coaches, they all want to play the same regional teams they've been playing forever, not travel 1,500 miles to play someone who won't help their Pairwise ranking (how NCAA at-large bids are determined). They'd prefer to travel to Houghton or Marquette to pick up those supposedly easy wins.
There are no "markets" in hockey, TV revenue is more or less zero, and it's not based on markets. ESPN is basically forced to show the Frozen Four as part of their deal with the NCAA to get rights to other more high profile events such as football and basketball games. College hockey is all regional television, save for a few ESPNU and CBS College broadcasts. Though there is reportedly a minor deal with Versus in the works. Nonetheless, markets and TV revenue are almost entirely irrelevant to college hockey conference structure. So the B1G schools don't have any desire to crack the eastern markets. They know the east - meaning northern New England and parts of New York - are dominated by Hockey East, namely the Big Four, and some of the better ECAC schools. There is virtually no market here for anyone to watch a Minnesota-Ohio State hockey game. Hockey occurs mainly on Friday and Saturday nights, so the majority of people interested in flipping it on casually would be watching their own team play live or otherwise on TV. I'm one of those select few here who'd be interested in watching some random western college hockey game, but I'm a BU season ticket holder, so I'm either at Agganis or at the road venue, so I can't see that game. The other "select few" are in the same boat as me with their respective teams.
Were UConn to make a miraculous upgrade, the others would likely be indifferent, and only concerned that the program didn't hold them back or dilute the conference. Ohio State already sucks, Penn State won't be good for a long time, so it's basically the big four and their two annoying little brothers right now. I'm not sure they're looking for a third, even more annoying, little brother who's a 4 hour plane ride away. And I guarantee you, if given the opportunity, the hockey coaches and fans from Minnesota and Wisconsin would rather be playing their longtime rivals North Dakota, Denver, and Colorado College every year than Penn State, Ohio State, and UConn. When Wisconsin held their outdoor hockey game, their fans complained that the game was against Michigan and not Minnesota or North Dakota. You can't approach college hockey in the same way you do football. Hockey fans and guys around the programs are stubborn traditionalists.