CPoS hasn't been tested yet, I'll give you that. NXT, Peercoin, Blackcoin, all are partially working. Bitshares is in the testing phase right now and DPoS, CPoS, are both similar in a lot of ways. When Bitcoin was being worked on no one was sure it could work but the people who took a chance were rewarded. It resulted in a great technological breakthrough and progress. We have to continue pushing for technological progress in my opinion.