There is no.
I don't know when bitcoin will be replaced or never at all. To be sure now I still believe in bitcoin and maybe other people too.
That's what happened, nobody knows about the future. Although many say bitcoin will be replaced by other crypto as an example of those who are very enthusiastic like eth and ripple, but as long as bitcoin still has a big influence on the crypto market, I won't leave it even though the price falls. The potential will always be there and there are still many people investing in bitcoin and even holding a lot of bitcoin, of course, of all those who have high confidence if bitcoin is able to become something very influential in the world later.