All I can say is that it would be akin to a few mobile games out there right now, only without that annoying "please buy stuff with real money" mechanic attached to it.
But it would require a bunch of scripting working in tandem with each other, so I doubt existing stuff out there would be able to pull it off. It would need a dedicated script author to do all the scripts specifically for this one project.
Perhaps when I plan it out further and there is enough to pitch, I will dump the idea on the RMN forums and if anyone wants to get it going, I would be more than happy to.