It's highly likely that the writers of the series had built in a contingency plan in case something like this happened. Showrunners have done same for far less major a concern. Whether or not the contingency plan could work/be implemented after episode 206 is the big question.
But now I'm also just as bummed we won't get to see JR's further schemes this season.
Here's a video clip I've posted before, "The best of JR Ewing"