Basically I am thinking of more ways for players to make "Expansion Packs" for the game, Story Mode which is coming soon is something similar which is a remake of The Telltale games like Wolf Among Us and Tales From The Borderlands.
Adventure Craft is an old "mod"(not really sure what to call it), but it made it possible for camera zooms and stories to play out, trying to make maps which have story can't be done easily without command blocks and third party mods or programs.
Each mode would probably be able to use mods, resource packs, and a map all in one folder, then you could upload to a database which could then be downloaded.
A bit vague for the suggestion section, but this can already be achieved.
Rollback Post to RevisionRollBack
Also take a look at this guide if you are requesting builders for a server/project.
Please note, if I deny a suggestion because it is already possible, then I mean it is already possible withing 10 command blocks (That do not spawn other command blocks) or up to 5 creations (Command blocks that spawn other command blocks) to make your suggestion.
If I critique your suggestion I am not hating on you. Learn the difference.