If people are using a language, it doesn't remain in a fairly frozen state.No, you wouldn't get any of that. If Latin was introduced as a common language for Europeans to communicate with each other (everywhere - in real life, on the internet, etc.) and nobody spoke it as their first language, it would remain in a fairly frozen state.
), while those actively using the language would be forced by circumstances to conform to the norm in order to understand and be understood by the foreign speakers.

(Which is why we have this concept of "spisovná čeština", a "literary Czech", which nobody ever speaks, but everyone is required to be able to write things down in it.)