I know i'm over brainstorming this whole thing but ideas are flooding in.. I think an important thing is make a roadmap for features, and we do not have to have them prepared, but planned to roll out if needed.
There is no such thing

We just need to brainstorm - so far 48hrs?? i don't think this is too long - maybe not much longer.
Prioritise / Rationalise into initial concept incorporating some USP features.
Make sure we have enough bounty / investment.
Get on with it.
ok clearing up my brain storm posts
quests are modular. even on their own servers, run by anyone who wants to add one if possible
game resources and game play mechanics are universal. XP earned, items found, etc.
Themes, stories, and baddies are quest specific, the author can create them using a template. with random encounters and item drops based on a per turn random roll with decreased chances for harder fights and then accordingly decreased chances for value of drops and special items
servers can set difficulty and reward payout levels, with posted difficulty