I found your post to be quite confusing. Here is what happened:
In the original timeline, we had the following TV series and movies in chronological order:
Enterprise
The Original Series + 6 original cast movies
The Next Generation + 4 original cast movies
Deep Space Nine
Voyageer
Within this timeline, several years after the film Nemesis, we know that Romulus was being destroyed, and Spock was sent to help protect it. He failed, and the wormhole that was created in his attempts to save the planet brought both Spock and Captain Nero back in time at different points in time. Nero was brought back decades before The Original Series would have existed, but his attack on the USS Kelvin is what created a new alternate timeline, now known as the Abrams-verse.
Everything that happened before Nero's arrival is exactly the same in both timelines: the third world war, the Eugenics wars, First Contact, Enterprise, and so on. Everything after his arrival has now been completely altered.
BUT
Everything that remains in the original timeline still remains true... it still happened, and it still exists. After Spock and Nero disappeared, we can assume that the people in that timeline moved on assuming both people were actually killed, and that's that.
Just to point out, Star Trek: Online takes place in the original timeline in the 25th century.