Cryptocurriences fail and new ones arise all the time. Even I've created my own cryptocurrency, nothing's being done with it yet as it's oriented project is still on the back burner. I do see a lot of them failing, but I also see more coming out. The ones I think that will survive will likely be Bitcoin, EOS, Steem, Litecoin and Monero. I've no information on other cryptocurrencies besides "De-Paws-It" which hasn't even been released yet due to lack of development on the proof of brain network (my project).