This is what I saw also as most of the countries that will likely to create their own stable currencies in order to preserve the value of their digital money. There are few countries already that are planning or have launch their own local currency that will be use in their country so we can expect that in the future we will be using a stable currency if in case majority of the governments will not favor in using the existing crypto currencies out there.

But all of it will depend to the decision of every government and with regards to usdt and other stable currencies, there is a very less chance that they will be adapted by any country as their main payment system as most of the countries will likely to create their own in order to have a control of the said currency.