So last night I finally got around to watching Terminator Salvation, which I thought was ok. I was a huge fan of the original 3, but I got to thiking last night... and something isnt setting well with me on this. And this something, IMO, almost makes the whole series pointless. Lets go back to the original movie. Skynet sends a T-800 Terminator (Arnold) back to 1984 to kill Sarah Connor, so that John Connor will never be born, and henceforth become the leader of the resistance. Let's say that The Terminator would have been successful in his endeavour. Lets say Sarah would have been terminaed, and John Connor never born. This would only create an alternate timeline, where John Connor ceases to exist. In other words, John Connor would still exist in the original timeline. This almost makes the whole series pointless, because sending these Terminators back in time never changes anything.. it only creates alt. realties. Any thoughts here, fellow sci fi nerds?