The only way these movies will ever be good again is if Arnold dies/stops doing them. The execs can't help themselves and have to include him at all costs, which means they need to find a way to fit him into the script. What the IP needs is to throw everything out of the window and find the right fresh filmmaker who has an actual love for the IP to make something new and raw. The only real things you need for it to remain Terminator is: An unstoppable killer after a nobody that is being targeted by something/someone for reasons well above their current status, the kickass theme song, and tons of action. Anything else is really just fanservice. You've already failed the moment you try to fit Skynet, or the Connors, or the T800 into things.