Would you use any of the same actors TNT used in the role of the next generation of Ewings or Barneses? The casting would be difficult for a Dallas continuation because the bar was set so high by the original. For example, the actor who played John Ross was a better actor than the one who played Christopher, but still he was not close to as good as Larry Hagman. For a Dallas continuation to be successful, you'd want actors of the same caliber that Dallas used. Dallas would not have been the success it was if JR had been played by an actor the caliber of the actor who played John Ross in TNT. Josh Henderson is not a bad actor, but he's not the caliber of actor Larry Hagman was. The main cast of Dallas had some great actors. It would not have attained the level of success it did if the casting had not been done with such high standards as they had.
Not only did they have great actors, but they were also perfect for the roles they played. Barbara Bel Geddes and Jim Davis were perfect for the roles they played. Ken Kercheval was put in a very difficult role to play and he was perfect for the role of Cliff. Victoria Principal might not be considered a "great" actress, but she was great at playing Pam.I saw her in one or two of the TV movies she made after Dallas and she was not as perfectly suited for those roles as she had been for Pam. In some other roles, Victoria Principal seemed to be an actress of average ability, but she played Pam Ewing extremely well. These perfect roles for certain actors are so good because they maximize their strengths and hide the weaknesses of the actors.