Someone probably came up with this or something similar; if not, here's my take.
>Streamlined dungeon crawling or SDC.
>A Cataclysm happened and destroyed the surface; now everyone lives on floating islands in the sky. You can have as few as one hub island to operate off of while exploring sky islands.
>Sky islands have dungeons on them, ranked 1 through 5, with difficulty scaling across the islands with the higher ratings. Rankings are determined by how much mana is seeping out of the dungeon. Higher-level dungeons (4 and 5) may require special items for entry.
>Generate dungeons using premade templates and RNG so DMs can easily pump out dungeons as needed
>Dungeons can have up to 100 floors, but most don't have more than 5 to 10. By tweaking the seed for generation, any kind of dungeon can be made.
>There will be 6 different elements and 6 different styles of dungeons that can all be mixed and matched for a total of 36 kinds of dungeons, on top of the rank, as well as RNG at play for the layout. This should give plenty of variety for dungeon creation, and the system will be plug and play, so custom modules can be added to allow for more elements and styles of dungeons for even more combinations.
>The culture of the sky island hub will encourage exploring the dungeons, so every session will be "Go to this dungeon, hunt for x objective". The objective could be treasure, a monster, or whatever else you want.
>Players will be transported to floating islands via airship (because airships are cool). At the start, players have to pay a fare to ride, but as they get more money, they can buy their own airship and even get a fleet of them together to get passive income.
This SDC concept is for people who don't really care about grand narrative stuff, and just want to explore cool dungeons and get loot. While a narrative can be added at the discretion of the GM, the module is built around getting players into dungeons with as little muss and fuss as possible.