The popularity of Bitcoin in the future will most likely increase and there will be more adopters compared to today. However the increasing popularity of Bitcoin will probably be a problem for governments because it will disrupt the distribution of fiat and it is likely that the majority of governments will not allow Bitcoin to become more popular. So I think whether Bitcoin will become the dominant currency in the future is quite unlikely because government regulations are increasingly strict. Moreover, until now most people treat Bitcoin like an investment instrument, so even though the adoption of Bitcoin is increasing it is not because Bitcoin is a currency, but an investment instrument with a good ROI.