I think some workshop accessibility would make Spiral Knights more replayable. A adventure maker is something I would like to see, besides Portal 2 did something like this with community tests, so if there was a adventure maker for Spiral Knights it could give the game a spot in the workshop. I doubt it's going to happen though.
they already said no to that kind of thing. it would take too long apparently and to be honest it would. I mean I personally wouldn't waste my time doing that instead of reviving the game.