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Per the last decade of interleague play results, the NL is Pythagenmatting it at a .387 clip.  A .387!! clip.  For a whole league in ten years worth of interleague games.  That's a LOT of games to be THAT bad.
If you called up the five best PCL teams and had 'em run shotgun with the AL for 162 games each...would they play .387 ball?  It would be close.
I liken the gap between a major and minor league to the gap between a grandmaster and a master in the ELO ratings.  A Grandmaster's 2400 will beat a master's 2200 about 2/3 of the time.  If the NL is Pythagenmatting barely better than I'd expect the PCL to do...then yes...I call the NL a minor league and don't look back.
To answer Doc's question above...I would rate the leagues thusly:
AL: 100
NL: 92
NPB: 90
PCL: 90
IL: 90
Although a lot of stars have come out of the NPB, it's not significantly better than today's AAA if only because there does not exist a very deep player pool who can play with team Japan.  Japan's best players can play with anyone...so could the best players in the Negro Leagues...unfortunately, the Negro Leagues were also minor leagues based on the kinds of statistics the stars routinely posted as compared to what they did in the big leagues when allowed to play.