I’m not so sure it’s a wonderful idea though 
A regular income would be nice, but it would also mean it would be a much smaller amount - sort of like musicians from sites like Spotify.
I also think it would only work if the assets they used became theirs with all the rights to modify as much as they want and retain after their subscription ended - which complicates it a lot as you have to give incentive to keep the subscription up in other ways.