Using USD to save money is different from using cryptocurrency. They are of different categories. I have not used dollar in any day so I don't know how good is dollar in savings. If ban has been lifted up then it is plus to the users. But I will still not advise anyone to save in USD. One of my brother told me last year that saving in USD is the best because it is stable in nature and bitcoin is not stable so I might loss my funds in bitcoin so he was advising me to save in dollar but I told that I like bitcoin more than dollar.
According to news this present president in Nigeria might devalue dollar in the country. So those who are saving in USD should be careful.