In my opinion there is nothing that is impossible in this world including bitcoin, if there are new coins that are better automatically automatically, bitcoin will be eliminated because people will certainly be more interested in new coins.
people always say that bitcoin can make things possible even the impossible but not to the point of beign replaced by other replica's out there . bitcoin is the original crypto and other's are just copy paster's . the only difference is thier name but the usage and purpose is still the same as bitcoin . so what's the purpose of switching on them ? other's can come and go but bitcoin is known to stay and last a lifetime . overall , id say that bitcoin cannot be totally worthless .