Everything is very likely, bitcoin is now # 1 even the market of all bitcoin cryptocurrencies reaches more than 45%, but this never makes eternal bitcoins and forever to be number 1, ETH, Waves and IOTA are very good coins and have the opportunity to replace bitcoin.
yes, blockchain develops very fast now and will be faster in the future, i cant see any real value of bitcoin, but other altcoin which can do help to the real world may get big support and widely used, at which time bitcoin will be replaced