My vantage point is in Vancouver and I'm pretty confident that the strongest of the giant teams could compete with the NHL product here in Vancouver during the early 70's.
To be clear it would only be a hand full of teams perhaps 2 or 3 that could compete with the really lousy NHL teams of the early to mid 70's. (72-75 probably being the weakest with expansion and WHA)
11-12 Portland Winter Hawks if they keep Nino and Ryan would be competititve with a number of teams as well.
http://www.hockeydb.com/ihdb/stats/leagues/seasons/teams/0054022011.html
Size of NHL teams wouldn't be nearly as big of a factor either as some Jr teams are very big as well as fast, skilled and playing great systems.
Todays Jr teams play complete systems and games while the early 70's Canucks were very north-south and quite slow and simply not a great collection of talent.
Now that you mention it purely looking at a player and when he played it's pretty obvious to me that at least 50 of the top 100 players of all time are playing right now if we do not give consideration for era and other factors.
Of course that's not fair to earlier players so we evaluate a ton of factors when comparing players to try to "even out the playing failed " and compare apples with apples.