Although, I haven't seen any reasons why bitcoin should become obsolete so far, I'm aware of the fact that nothing can stop people from developing something new, more reliable and sophisticated than before. Should this happen, Btc could potentially be replaced by some more advanced crypto, unless Btc develops as well. I know it sounds ridiculous for some people, but do you remember what many photographers said about digital cameras? I do! They said digital cameras will never replace film because film is unique, it has some characteristics that were impossible to be reproduced by digital cameras, etc., etc... Whatever happened to film cameras? Does anybody use them anymore?
Think about it.