He's a great character, but I couldn't see him being used much, unless he's a regular villain or the main focus. It would be weird to see a Kermit look-alike in crowd scenes, especially for people who aren't aware of the movie (currently I don't think there's anybody unaware of Muppets Most Wanted, but there could be in the future.... Though maybe you can say that for any of the movies).
Of course, I didn't think Miss Poogy would return after The Muppets, but she appeared in Muppets Most Wanted. Of course we haven't seen the other Moopets, most of whom look more identical to their Muppet counterparts. And Miss Poogy's role there seems more like puppet recycling than the character making a new appearance, except she's still got the same basic personality and performer, and the credits do list her by name (and the junior novel identifies Miss Poogy by name).