Well I look forward to seeing what you and the-ego-is-you come up with for the foundation. I will find a place I can step in and help and I will do that..
One cool thing about pixel dungeon engine is that in theory you could utilize something like JohnnyClearwater's pixel art challenge to help you create a lot of the art going on throughout the world, they come up with awesome stuff for that challenge. It would get random people more heavily involved in the game, open sourcing art through a challenge.. Give them a shoutout in the credits and they will surely want to own the game just to say see, see what I built lol!
Great idea, I'd love to see collaboration with other projects happening. Key to get here is that there is de facto shared ownership of the game. Everything is released openly, open to use, reuse, repurpose, mix and remix. So it will be much more than credits any contributing artist will get from their involvement.