Yes. That impacted the perception of the tournament in Canada, which is what I talked about. The relationship between the IIHF and the NHL is not the same thing as perceptions of an IIHF tournament in Canada. The NHL is not Canada.
Inferior Canadians (in some cases Americans as well). As far as I know the best players from Europe were allowed to participate. Would the scores have been more lopsided? Yes. The tournament would have at least had legitimacy to call itself a world championship though, and the participation of hockey players who were actually famous in North America might have drawn at least a modicum of interest. There seems to be a different perspective between North Americans and Europeans on these matters, but in Canada people would rather see the best play with lopsided scores than inferior players (ie the Canadians who were inferior) playing somewhat closer games against the opposition.
I disagree, as the tournament would have at least been viewed as a legitimate world championship. Teams losing to players that Canadians knew were far from the best hurts the tournament far more than teams losing to the best players. The tournament looks worse when the best players are unfairly banned from competing. I don't know if they NHL was interested in sending its players, though I can speculate that they weren't. Unfortunately we can't know, since the IIHF banned them and thus removed any reason to consider it.
I don't know how the players felt about it either, though they probably viewed participation as an impossibility given that their predecessors had been banned, and in some cases for decades. I remember reading how Gordie Howe was excited prior to the 1974 Summit Series to finally represent Canada. He said he was tired of people asking him his nationality, and that now people would know he was definitely Canadian. Seems to me that he would have enjoyed the opportunity. Probably even more so if players he would have looked up to (Shore, Morenz etc.) had been involved in the very same tournament.
The 50 years figure represents the amount of time that NHLers were banned from playing in the tournament - it's a fact, not a matter of opinion. That's 50 years of Canadian fans being aware of a tournament calling itself a world championship, but also banning the best from Canada from participating. That is obviously going to leave a negative impression in the minds of Canadians. Do I think that Canadians were up in arms and outraged at the IIHF's unfair practices? No, of course not. Lack of outrage doesn't mean that it didn't make the tournament look insignificant to Canadians.
I don't know what debate you are talking about. The NHLers were not allowed to participate, that is the reality of the situation. That they didn't push to enter the tournament is beside the point - they should not have had to push. The tournament's reputation (which is what I have been talking about) was harmed by the IIHF unfairly banning professional players. Many fans in Europe love the IIHF World Championship in part because of its history there, as generations of the best from those countries participated over the years. Not so for Canadians.