I wish some great design team would make a great DCC sandbox RPG. I'd think you'd just have to create a new player, have that crawler advance through the levels, meet sidekicks and zany monsters, have him cross paths with Carl a few times, etc. I mean, Dinniman created a world based off games, it should be manageable if you could get the right team on it, like Bethesda, Naughty Dog, or someone creatively similar.
Jeff Hays would get guaranteed voice roles, as he should, because hes a genius at voice acting.
The DCC footprint is growing by leaps and bounds. I dont know many "casual" DCC fans. With that following, and it only growing by word of mouth, why not expand into the game world, where the story has its roots, anyway?
All that said, I volunteer my voice acting talents to voice a randy tavern-owner NPC in a medieval Hooters equivalent, with painfully juvenile bawdy puns, with a complex back story with Mordecai, and lots of humorous dialog and a loveable and endearing history.