I'm pretty sure DMM's Angelic Saga ended quite some time ago, and the Nutaku version has been getting new stuff. Hitsuji Chronicles ended in DMM several months back, and it's been said that our version will be getting new content, if I'm not mistaken. The same is supposed to be happening with Osawari as well.

If the people in charge of the localisation/etc. feel that it's worth the effort, they'll likely keep it going, bringing in artists to design new cards.