Not this time, it hasn't.
Not only have the writers themselves said so, but Spock Prime's presence is proof enough.
How does Spock Prime being there prove that?
Why because hes there after history is changed ? Picard and co were there in FC after The Borg changed Earth's past and that wasn't different timeline. ST inidcates if you go back in time your protected from the timeline changes...You become seperate from the universe not the other way around.
The writers are threw a bone to some fans because they were ready to lynch the writers for changing the timeline despite always hating RESET buttons in time travel stories
no it just ment they were paying attention to the mirror universe and to
For any event, there is an
infinite number of possible
outcomes. Our choices determine which outcome will follow.
But there is a theory in quantum physics that all possibilities
that could happen do happen in alternate quantum realities.
so there is certainly a prior trek basis for it.
going back to the romulans..
was it ever said any where how big was the empire and how many races it involved.
I don't think it's ever been mentioned on screen. But it'd be pretty lame if the "Romulan Star Empire" had only two planets haha.