I think it would be totally awesome if SE opened up a brand new server and prohibited people from paid transferring to the server. I think with all the awesome changes SE has implemented over the years (level sync, faster skill ups, fov, increased exp etc...) I think it would be a BLAST for people (those who want to) to go back to the days of eco-warrior and sub job item farming.
I've always wanted to restart, but given the saturated nature of the servers after a decade, it just isn't that much fun. It would be fun to have that 'authentic' FFXI experience again pre-abyssea leaching, combined with all the new awesome changes that have taken place over the course of the ongoing game development.
Thoughts?? I think this would appeal to a lot of people and wouldn't require a lot of work on SE's part.