I would want a Resistance trilogy that is a character study about John Connor. With no time travel elements until the end of the last film that sets up T1&2. The first film would be the fall of civilization and the start of the war. See how John prepared for that and began rallying survivors. The first film would predominately have HKs and endoskeleton terminators. The second film would introduce the infiltration terminators starting with the rubber skinned earliest models. This would be expensive but I think it would be great to have a de-aged Arnold as a member of the Resistance that disappears for a while and returns as a T-800. The last film would be the last great seige of Skynet as John learns they’ve cracked time travel and are preparing to assassinate him in the past.
There’s a lot you can do with the future war setting that they squandered with Salvation.