The mainstream adopted the sneaker culture. And the shoe was called Concord XI low so it was bound to sell out.
I can't believe anyone thought these would sit.
As far as debating on which J is the best, most popular, etc is pointless. The only thing we can say is Nike banks on the XI for their big retro release of the year (Concords, Breds, Gammas, Columbia, etc). So it's definitely a huge seller. The other thing is Mike wore the XI during his teams best year and first championship post first retirement. But, personally, I like the 1s, 3s, 4s the most. XI are nice though.