The showcase should definitely be expanded upon, however, feature/highlight games should remain. Because I think they are excellent examples to promote new developers to C2 to strive harder to reach those quality status.
It was The Next Penelope that really inspired me to push harder in C2, to set the bar higher and not just think of it as a simplistic engine for simple mobile games. I am very glad I did.
Exactly the showcase should be expanded showing new and old hit games. The Next Penelope was incredible and the platformer thats on the showcase page as well. We need the new blood like Ignatius which shows how you can mobile optimize your game without cutting out features.