I fully agree that a professional women's league will need an NHL partnership to be viable, but I don't see any reason for the NHL to enter into one. The closest analog, the WNBA, has never once turned a profit and I don't know if the synergies around brand recognition and marketing it provides to the NBA are worth the cost of subsidy.
I think this is where the North American model is far worse than the European model, or how college athletics work (my background in college athletics is why I think the way I do on this topic).
Everyone here is so caught up in "never turned a profit" and all that stuff. But profit is revenue AFTER EXPENSES.
How much does it cost to start a women's hockey team from scratch? A lot. Millions.
How much does it cost to start a women's hockey team... when you have an NHL team? Chump change. It's like Vinik letting the US Women's Hockey prepare for the Olympics in Tampa. He HAD everything a team needs to train for hockey games; he just let them use it.
I'm not saying a 32-team WNHL with the Lady Lightning playing the Canadiennes. I'm saying that the additional expense of NHL teams to operate WNHL teams, too, would be a hell of a lot lower than the expenses of running an independent league. The largest expense for the independent women's league teams... RENTING the ice to play/practice on!
The NHL teams have practice arenas, most that have fan seating they can sell tickets to, that would make great WNHL game arenas. So you can eliminate that expense and help you get closer to a profit right there.