Kirilo81:Interesting claim, please give me one-two examples.

I have a friend who is a linguistics professor. He is the one who told me that. He says it has happened many times through history. Especially in the Roman empire where small islands were isolated from the main regions.

"Most linguists believe that a creole develops through a process of nativization of a pidgin when children of pidgin-speakers use it as their primary language."
https://en.wikipedia.org/wiki/Pidgin

sudanglo:There is a strong social pressure in the Esperanto community to conform to correct/standard Esperanto...

That is reassuring.

The only circumstance under which I could imagine that beginner's speech might change Esperanto grammatically is if the fina venko arrives by decree and the world dictator suddenly forces everybody to speak Esperanto.

Hopefully we never have a world dictator. Lets say that the UN adopts it as an official language. I think that experienced speakers would be overwhelmed with trying to preserve the language.