I don't think NASCAR can do anything to make the at track fan experience any better. I don't care to see a band perform when I go to a race. Maybe have wifi available, although I'm not sure that is feasible with large crowds.
I got a little flak from the family this weekend about my disinterest in the sport. They want me to continue to do the annual LVMS and ACS family get together. For them it's about family and not about the racing. I guess for me, it is also. For me, the tailgating with family and friends is far more enjoyable anymore than is the racing or anything happening in or out of the grandstands. There is nothing that NASCAR can do that in terms of a fan experience that could make me change my mind.
My loss of interest in the sport, primarily, is the constant meddling of the rules, the implementation of (and constant changing) of The chase format, etc. If NASCAR wasn't losing money, overall, then they wouldn't be making so many changes and they wouldn't be desperately looking for ways to keep old fans while attracting new fans. IMO.
In my eyes, a 5th place car, 82 points out of the top spot, was crowned Champion in 2014. For me that is a hard pill to swallow. It's hard for me now to follow a sport that basically has a gimmicky lottery finish to the season. Resetting the points after a race is similar to clearing the scorecards after each round of a boxing match.