Your comment reflects a lot of the sentiment that I've seen on this board and elsewhere in the past several days, and I'm sure that it will intensify in the next few weeks unless we see some miraculous turnaround. However, this probably has little to do with stubbornness or arrogance. JR may have those qualities, but I suspect that the decisions are quite rational. Go back to Lip's August 21 posting earlier in this thread. He indicated that there is a big tax incentive for JR to NOT sell before he passes away.
If he doesn't sell, but wants to shake up management at the very top, that person has to learn the organization and set up his/her own structure. That takes time. It would be a highly desirable position, but, again, the owner's age probably adds some risk to anyone considering it. JR may be in great health and very sharp, but he's probably acutely aware that could change at any time. So will anyone wanting to take on the position.