Re: Timeline branching going forward *spoilers*
First Contact' changes Zephram Cochrane, who talks about a future with Robotic Zombies. One could say the universe Picard and crew returned to in the 24th Century was no longer the Prime Universe.
It sure looked like the same universe to me. There's no evidence anything was changed there either.
It is by caffeine alone I set my mind in motion. It is by the beans of Java that thoughts acquire speed, the hands acquire shakes, the shakes become a warning. It is by caffeine alone I set my mind in motion.