First off, I love dot Hack and many of its various stories, games, movies, and shows. I've enjoyed the games and will most likely track down and play all of the non-localized ones.
Having said that, I feel like they have already made dot Hack MMORPGs akin to the dot Hack titles.
The Final Fantasy MMORPGs have that fantasy feel, team building, and customization with gear and classes that is reminiscent of the dot Hack series. Also, the Monster Hunter series provides that scale of customization and awesomeness against impossible odds alone or as a team that is so definitive of the dot Hack series. Also, since they seem to be including armor and weapons from famous game icons (Link from the Legend of Zelda series), it's only a matter of time until the heroes of the dot Hack franchise get a little love and recognition.