I wouldn't have wanted to see any more "shocking twists" than we already saw. Then, I never saw Dallas as a soap opera. I saw it as a modern day Western drama that just happened to use the serialized format sops were known for.
Would it be accurate to say soaps are known for having an unusually large number of "shocking twists" in their stories?
When Dallas started pushing the envelope for how over the top or ow outlandish their storylines could be, that was the beginning of the end. Think of some of the storylines used in the waning days of Dallas and imagine those storylines being proposed in the earlier years, when Jim Davis was still alive, seasons 3 and 4 especially. Can you honestly picture at that time a storylines such as "What if we get JR to accidentally get himself trapped in an insane asylum just so that he could try to get a crazy old lady to sign him the voting rights to shares of West Star he didn't own anyway"? I really think they just would have laughed and asked "No, seriously, what ideas do you have for us"?
They reply "Ok, seriously: What if we have JR on a hunting trip in a rural area met a beautiful young woman and so he seduces her an they sleep together. Then the next morning he's accused of rape. He's not allowed to call his lawyer and is tried by a Justice Of The Peace. He can't do anything to get out of it and his family never comes looking for him. So, he's sentenced to 10 years of hard labor. JR will end up working on a chain gang until the brothers of the young woman he slept with abduct him from the prison, take him to their farm, and force JR to dig his own grave. How do you like that idea"? Oh, he'll eventually escape and make his way back to Dallas but then the young woman he slept with follows him there and tricks JR into marrying her! How about that?"
"No? How about a story where Cliff and JR both need up owning half of Ewing Oil. So, JR sells his half of Ewing Oil to Cliff because he thinks he will get the job of running West Star. But he turns out to be mistaken and ends up with nothing! How do you like that idea"?