Anytime soon now, not at all if I'm honest, but in the future yes its possible for sure but it would just take some time to achieve this.
If think in much much time this can be achieved I' thinking about 10 years from now on if I'm realistic.
Bitcoin will not replace dollar soon. At least not for the next 20 years. The user base of bitcoin is too small and governments will try their best to curb the usage of bitcoin.