Actually, John jumping forward didn't create a new timeline. Only backward jumping does that. Since (normally) the future hasn't happened yet, timelines don't really exist forward. They only exist behind you (which is why the future is normally not set). John merely jumped ahead and now sees what everything from the last ~17 years led to. And since he didn't exist for those last ~17 years, one of the significant things is that no one knows who he is.
But I totally agree that it would take someone jumping from that future (or later) to 2009 in order to break Sarah free of the timeline that now goes all the way to 2026/2027 (or whenever John is). The show seems to break timelines to the known future when a backward time traveler does some that changes what their future had been (such as Derek killing Andy Goode, which wiped out the Billy Wisher he knew from his future) rather than merely arriving in the past.
So I figure this timeline, where John Connor ends up being a nobody, was created by something that a backward time traveler did that caused John to make that choice to jump ahead. Maybe it was the water cooler terminator's attack on Savannah, which created the series of events that led the Connors to the moment of the time jump choice. Heh - didn't meant to get all time-travely.
Yeah, I don't just don't buy Sarah letting John go like that. I have a really hard time with John's choice too, but Sarah accepting it was too much for me.
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But I totally agree that it would take someone jumping from that future (or later) to 2009 in order to break Sarah free of the timeline that now goes all the way to 2026/2027 (or whenever John is). The show seems to break timelines to the known future when a backward time traveler does some that changes what their future had been (such as Derek killing Andy Goode, which wiped out the Billy Wisher he knew from his future) rather than merely arriving in the past.
So I figure this timeline, where John Connor ends up being a nobody, was created by something that a backward time traveler did that caused John to make that choice to jump ahead. Maybe it was the water cooler terminator's attack on Savannah, which created the series of events that led the Connors to the moment of the time jump choice. Heh - didn't meant to get all time-travely.
Yeah, I don't just don't buy Sarah letting John go like that. I have a really hard time with John's choice too, but Sarah accepting it was too much for me.