Genisys was terrible, still am very curious for a sequel though. It's like a trainwreck, you can't stop looking at it and being fascinated by how terrible it can get. Watched Salvation once, various years ago, don't realy remember finding it as bad as most seem to find it, so far, i think Genisys is the worst one.
Anyway, while the franchise should just be left alone, there are two ways a studio could make another decent instalment:
1- A sequel to the original two film set during the end of the war, as John Connor and Kyle Reese face their final decision, possibly with flashbacks of how they met. Would just be a final story to go full circle;
2- This would probably anger many fans, but a complete reboot that just takes the plot of the first film and incorporates stuff Cameron had to leave for 2, like the characters trying to destroy Skynet before it's created, wouldn't be that hard to pull off and might kick-start a new film series. This way you would have a more coherent plot than the past 3 films and it would give them the oportunity to rebrand and move on without Schwarzenegger.
Anyway, 2019 is when Cameron gets the rights back, i guess it's safe to say that once that happens, there probably won't be any new Terminator film in a looong while, if it even happens.
