Please no. Changing the definition of tags after they are in use is enormous effort, of which updating the wiki (and even reaching consensus) is just a tiny part.
I object specifically to the sentence: “where a permit is routinely granted to everyone requesting it”. I’d rather state this as ‘if there is an official way to request a permit’
If current value permit is likely to lead to mistagging by people who do not consult the wiki before they start using the tag, then perhaps it should be deprecated, and separate replacements invented like permit_restricted (i.e. permit that is restricted and may only be issued to some people) and permit_anyone (current meaning of permit, i.e. permit which is routinely issued to anyone that asks).
(of course better names would be welcome, if someone is interested in starting such proposal process)