One problem with America/Canada too is that, they have the NHL so anything other than the NHL is 'minor league/beer league/pointless'. US/CAN isn't so much a 'hockey countries' but an NHL countries and that is a shame because there are great hockey leagues outside of the NHL BUT the majority of NHL fans simply do not care - this is also evident by the amount of minor leagues that appear and go bust and also the AHL which some teams struggle with attendance and fans.
So other than the KHL and maybe one or two more leagues it wouldn't be worth setting up all the deals, infrastructure to get a hundred extra people watching their product I don't think. It's a shame because even in Europe its almost impossible to watch certain things (Hello Swiss league) but that's why other avenues exist. Although I agree i hate watching at crap quality full of ads. I'd happily pay for some kind of Netflix of Hockey type system!
I disagree with everything in your post that I bolded. There is a lot more than NHL hockey and hockey fans here or even beer leagues.
For 2018-19, the last full season, the AHL had teams that averaged from 9021 fans a game in San Diego to 3067 for Belleville in Canada. If you average those two numbers, the high and the low gives you 6,044 fans a game. When you have 31 teams, like the AHL, you will always have a few that struggle. It is going to resemble a bell curve when you have that many data points. The AHL has been around since 1936 and will continue for many years into the future.
I don't think that their 6.5 million fans a season are going away. The AHL has some national and local TV coverage. You can pay for games on the internet.
The IHL went from 1945 to 2001, when it was absorbed into the AHL. I have been following the Milwaukee Admirals, an IHL member from 1977 to 2001 and then into the AHL from 2001 to present, since 1981. They averaged 5412 during 2018-19. In the AHL years, it has been as high as 6329 and they usually run in the range of 10th to 15th in league attendance. In the IHL days, the Ads went 3 straight years averaging over 9,000 fans a game.
Below the AHL, the ECHL has 30 teams. The AHL teams call up ECHL players for injury replacements, just like the NHL calls up AHL players. Milwaukee's parent team is Nashville and their ECHL affiliate is the Florida Everblades.
After the ECHL, I don't really follow hockey other than some college teams like the Wisconsin Badgers, who are six time NCAA champions.
In Canada, they are crazy about Junior hockey. They have over 130 teams, but a few of them are based in the US.
The US also has Junior hockey, but not like Canada. We also have US college hockey for men and women. They have 138 and 93 teams respectively.
The US has 568,000 registered hockey players and Canada has 621,000 registered hockey players.
I don't see how I could follow any European leagues. There really isn't enough time. I know that some Nashville prospects or players are over in the KHL right now. I see some highlights on YouTube.