"Arnold Schwarzenegger has said that he will be returning to the Terminator franchise... Schwarzenegger confirmed that he will star in a new Terminator film produced by James Cameron." - via Screen Daily
I"m alright with this. Being that the whole concept of Terminator is based on time travel, any and all avenues could be explored at one point or another without having to retcon or "erase" past films. Plus, I'm all for anything that will distract Cameron from his obsession with the world of Avatar. Let me add that I had no problem with the direction Terminator: Genisys took the franchise. I thought it was a smart way to bring an aged Schwarzenegger back to the series and reboot the whole thing.