Its all a matter of time before the bitcoin maybe can take it over and replace it but the chance is less more than 40% for sure.
Yes that is simply not possible that bitcoin will replace dollar in near future, as it will require a strong and valid reason to replace it and as of now we don't see anything like that.
Yeah dollar is very powerful and not that easy for any crypto to replace it as market cap of dollar is huge and bitcoin is too small in compare to dollar.
Bitcoin will also be powerful in future and we should give some more time to it and we should support it and we will see much better bitcoin in future.