From these several years passing bitcoin is gaining its good reputation in terms of legal transactions via internet and i don't think there's another cryptocurrency that replace with it because bitcoin price is still the leading of all cryptocurrency right now, there were some kinds of cryptocurrencies gaining reputations but they were just only an alternative source of bitcoins and not itself. For me with strong belief of bitcoin, i'd rather say no one can replace bitcoin at all but we should believe that there would be a possibility of new form of coin will be made but doesn't replace bitcoin in the near future of internet world that somewhat similar to bitcoin because freedom is always there specially more programmers were developing their skills and there is no limitatiins in competition right now on the world internet we are bound to have free will all the time.