I had previously doubted that Bitcoin would be replaced by another currency. But my mind has changed. Because I see there are many other cryptocurrencies that the developers are trying hard to solve the problems in cryptocurrencies. What about bitcoin? We don't know who are the developers and no effort is being made to develop it.
If you don't try hard, your rivals will win. Bitcoin's rivals will win too.
I think I doubt that bitcoin will get surpassed by any other cryptocurrency because it is pretty much on top and what happens to bitcoin will also reflect to any other cryptocurrrencies out there because it is the standard for a cryptocurrency. Seeing it fail might cause demotivate feeling for those investors of other crypto because it might as well end up like bitcoin. Bitcoin has a long way to go through after all, we will still see it become our currency in a more technological world.