You guys are so funny. Look, the entire Terminator franchise is a paradox. If Judgment Day really was prevented at the end of T2, then John Connor should have done some BTTF fade out of existence trick. And don't get me started on who John's father was in the first timeline...
Not that I'm saying the Termy flicks after Part Deux didn't shit all over the franchise. I mean goddamn, have you seen that ridiculous Genisys trailer? I'm still waiting for them to say "JUST KIDDING! Here's the real movie."