Why do you think that it will happen? Bitcoin is still strong and it will always be like that, the worst thng that you can do is just to think that bitcoin will be replaced or that it will stop existing in here, bitcoin will be in here for the next decades
because the technology will always grow forward and that's what lies behind them thinking that will come a more sophisticated coin?
whereas bitcoin is still very strong and growing, bitcoin not only runs in place dude, but also has updates, so you don't need to fear bitcoin will be outdated