#4 Retired drivers.
Another person who could benefit from a buyout are the drivers that have massive fan appeal and are currently retired from the sport. Not only would a buyout be a chance to start bringing about changes to the sport, but also a chance for NASCAR to invite stars back to the sport for relevancy purposes, which will excite longtime fans as well.
While some drivers are probably content with the next stage of their life, there are others that would be more than happy to come back to the sport, have a chance at making history and collecting a paycheck doing what they love. It might even create an intense buzz around the sport that brings back fans who walked away years ago.