Actually, as I understand it a 7th Canadian team actually hurts the 6 Canadian teams, because they will have to share media revenues with them. As I understand it, CBC feels a team in Winnipeg has no value add for the network, doesn't hurt them and doesn't help CBC either. I would suspect the 6 Governors don't really want a team in Winnipeg, but that CBC just doesn't care one way or the other.
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On the other hand, I would think the reverse is possibly true in the US. A Phoenix team moving to Canada might give each of the remaining 23 a slightly larger slice of the pie.
There are national TV contracts with CBC, TSN, RDS, VS and NBC. All of that revenue, regardless of the country it came from, gets split 30 ways. Having a 7th team in Canada doesn't cut into the share of CBC money that the other 6 teams get.
The only argument of any significant impact on other Canadian teams is local TV money. I'm going to guess that Manitoba is somehow in the Toronto Maple Leafs TV region, someone can correct me if I'm wrong. So, in theory, Toronto can be upset that they'll lose 1 million potential viewers from their fifedom as that will now be "Winnipeg TV area" from now on, although I'd argue that local TV areas are becoming increasingly insignificant and almost all games are available on TV / online if you really want to watch them.
Any argument beyond a potentially lower local TV contract for Toronto, or and projecting of unwelcomeness from any of the other Canadian owners, is wishful thinking or at the very least, misguided.
I'd like to know how it is that you understand that CBC feels Winnipeg adds no value. Extend that to TSN as well, since they have a national TV deal too. Understanding that any TV station's main goal is to maximize viewership, I'll ask these three simple questions, let me see if you still hold the same opinion:
(1) Would TSN rather be showing a Detroit - Phoenix round one series or a Detroit - Winnipeg round one series nationally in Canada?
(2) What would pull in better ratings on the CBC Saturday late game, Vancouver-Atlanta or Vancouver-Winnipeg?
(3) Would CBC rather show a Stanley Cup final that has one Canadian team or two American teams? Think the CBC would prefer a Florida-Phoenix final or a Florida-Winnipeg final? Which series would attract more viewers in Canada?