Most if not every country has got some levels of security in their legal tender which has got some economic attachments and links to the national economic and their financial security so adoption another legal tender at a snap is almost not attainable, it will take some time for them to get that doen, although Individuals and households can adopt it without going through some rigors because of they have that flexibility to accessing the value of such without really needing  the government but it's different with the country because it a national concern that bothers on their economic security to an extent.

Other countries like the aforementioned have been able to scale through that already but they didn't do it within a day, it took some time and so if Other want to follow suit, they will need the time and all of the process and required scrutiny for them to build some level of confidence enough to trust it rather boost than threaten their economic situation.