There are concerns that the lack of necessary legislation could lead to a wave of CBDCs that banks or financial institutions could be free to launch. The state alone cannot work on developing and launching this type of currency without entering into formulas and agreements with other financial institutions and defining the powers of each party.
They can be free to launch their CBDCs at their nations but their CBDCs will be restrictedly used in their countries only. To be accepted globally, it will be more complicated from global, continential, union regulations and politics too.
I believe global organizations will not easily accept national CBDCs under big pressure from giant nations like the USA, China, ... and being used only nationwide will not be so good for CBDCs.
CBDC are created for internal control and, of course, will not be used for settlements between other countries. This is a replacement for national currencies. For example, it is impossible to pay with the Turkish lira anywhere in French Polynesia, because the laws of each country state that the only legal tender in the country is only the national currency. In Turkey, the lira, in Polynesia, the franc, and so on. That is, I assume that in each of the countries in the future there will be CBDC-TRY, CBDC-CFP and the like, which will be in use only in one particular country of their origin.
And if we talk about a single and global CBDC (it is impossible to predict whether there will be one single global CBDC at all), then this adoption should be delayed, because of:
To be accepted globally, it will be more complicated from global, continential, union regulations and politics too.
as you say. It will not be easy for countries to agree on this, and perhaps the result of this will be a digital dollar or euro, and maybe the yuan (or some other currency).