If the ID is permanent then governments will require it, because they can. If it has attestations or endorsements, governments will require a government endorsement. Think about what China, Iran or Russia would do with a permanent ID being a standard. The US, England and the EU are not immune to the same impulses.
Always online is no different than an email account or website, and the rate of change would be, at least, minutes not seconds.
If governments want to do these things, they already can. Phone numbers are KYCed in many countries, for example, and many messengers mandatorily require them.
The lack of an interoperable key standard isn’t stopping them. (In fact, it’s even helping a bit by providing cover for MITM snooping)