James Dean said
That's exactly why the J-League will never rival the Premier League, because it's full of Japanese players! Japan are a decent second tier nation, and have produced a few genine world class players, but they won't dominate the world and neither will the J-League for that reason.
I would agree the J-League would not rival the Premiership League as long as you have it as an EU League. I wonder though how the football leagues would look if all players only played in their own country. I doubt the Premiership League would be that flash.
If you consider the fact that NZ played Japan in 82 and beat them and then look at how far Japan have progressed since then, they've come along way for a Country where their professional football league is not even 20 years old. You only need to look at how far their world ranking has progressed in comparison to NZ.
I agree with what someone else said that their mindset is definitely what lets them down ie: they rely on their coach to analyse the game and tell them what to do. Arsene Wenger who coached there for a couple of years stated that this was the only thing that let the Japanese down, as far as ability and technical capability they were as good as any other players.
You should keep in mind the fact that they have a population of around 135-140million and if you consider the other areas where they have become world dominant eg:baseball, economics/manufacturing it's very possible they can become a major player in the Football arena as well.
People need to get past the fact that they think Asians can't play the beautiful game - Australia realised the only way they were going to progress their football and play at a consistently high standard was to get into the Asian Confederation.