I'd be happy with "Adventure Creation/Realtime-GM Tools" allowing non-developers/programmers/scripters to create adventures and publish them ASAP followed by more advanced Mod/script/developer tools.

I really think we need "push-button" publishing simplicity (ala Neverwinter Online Foundry and Sword Coast Legends). I think "storytellers and GMs" are probably a far more massive target audience than scripters and 3-d artists and terraforming world builders.