I'd definitely play 1.8 more if there were different games but as there are only 2 games which both consist of fighting on a tiny island I don't play it too much at the moment. I'll repeat myself from the few other threads I've seen about bringing back 1.8 games, Cubecraft is only declining in 1.8 because of lack of diversity. It has nothing to keep players on the server, if you think 2 similar games is the maximum potential of what the 1.8 side can be then you are mistaken. They are 2 good games but 2 games is not a server network by themselves, they need games to back them up and bring more interest rather than them just going to another server.
Edit: I know this is talking about a while ago but when Cubecraft was a 1.8 server they really had something great going, the server was rapidly growing. I think with some care Cubecraft can reach it's potential again. I'm not saying 1.9+ hasn't brought great things because it really has... but I think things could get even better.