If that happens, what happens to the UK? Does it just become "The United Kingdom of Great Britain", dropping "and Northern Ireland". Or do we stop using "The United Kingdom" as it sort of ceases to exist in its own right and revert to just "Great Britain"?
This is a debate the UK government will want to avoid at all costs. I'm amazed they are even considering talking about the ".gb" domain, it bring up difficult topics.
It's sort of schrodinger's domain, don't check on it and it both exists and doesn't exist at the same time!