Just out of curiosity, but isn’t passive investment already solved with delegation ? There are tons of curation trails and voting bots that will give RoI on your delegation giving passive income on said investment.

Also, even if they didn’t curate, their investment wouldn’t be actually different from any other coin at the moment. The investment would be in the believe that the value of the coin would rise. On top of that, they have the option to blog, curate or delegate for extra return of investment ...

I can’t help but feel you’re trying to solve a problem that’s not there. Or I’m not seeing the problem you’re trying to point out.

Perhaps delegation for passive income is something that could be ‘formalized’ in some way or another. So that you can delegate, from the wallet, to an officious account that will handle the delegation or something like that.