>>1
Easy answer, do what the popular boards are doing right now. I'm sure if 4-ch switched to phpbb, established a "rep" system, postcounting, etc., it would get popular and turn into a typical english speaking animu board like the hundreds out there.
How did 4chan get such high posting rates? By allowing it's base to create the content, hate speech, whatnot - result? People visit.
2ch is made popular for news4vip, 4chan by /b/
If 4-ch wants to be popular, dqn has to be popular first.
You can't get people to visit a board where the subject matter is alien to the masses. 4-ch will never be popular imho.