I doubt that there is any other cryptocurrency or altcoin that can supersede the bitcoin. 
But it dosen’t really replace the coins as they still give their function in their own blockchains, it is just that when you can use one blockchain as control panel of every other chain. For some new kind of money to come along that can do the same to bitcoin it would have to be so advanced that we cannot imagine it today. I believe telepathy would be required, or it may be be based on some kind of data that can be sent faster than light.