Greetings,
Purely scientifically, you all forgot something very important: Our dear friend Albert Einstein discovered it more than 80 years ago and it was spoken out by someone I can't remember his name.
Time flows at different pace for each system because those systems go to a different speed (i.e.: Relativity theory). In theory, a system in a galaxy moving 10 times faster than our galacy will flow 10 times slower than us (A vehicle moving at speed of light will see the people around it frozen.)
So, Sol III (us) could see 2000 years pass by while planet X in another galazy could see 1 million years pass during that same Sol III 2000 years.
It makes all those silly sci-fi movie and television show quite archaic.
. Of course, Star Trek universe is all in the same Galaxy, so the time is almost all the same. But what about the galaxies at the edge of the universe that travel 2000 times faster than our galaxy? One year here is 2000 years there. Imagine the progress of the last 100 years (wireless, nuclear, etc) here are nothing compared to the progress an identical society could make in 200,000 years.
Thank you