This would be a SERIOUS problem because the PMD worlds are randomly generated. Also, it wasnt really the game most people enjoyed, it was the story behind it
In laymans terms, I feel like this idea would be like the LoL server idea, pointless. I'm not shooting down anything, just stating my opinion
Edit: Even more so, what would players do besides raid the same dungeons over and over, PvP, and get items?