When it comes to reviving them, I look back fondly on what the Dojo system taught me; it's part of why I'm still around, in fact, because it engaged me and kept me coming back to the forums. However, I don't know if we have a consistent enough set of new folks to bring it back and keep it running - how many new folks do we get on a weekly basis that don't even make it out of their first month?
What I'd really like to see instituted would be an official, or semi-official, apprentice program. Someone who was looking to become a Gym Leader could talk to a current Leader of their preferred type who would offer advice, help the person acquire Pokemon, and arrange for battles to get them practice. Maybe after a couple months of this, have a slightly revamped Dojo League that only ran for 6 months, enough time to get them practice but not so that it ran on forever.