#2 bigger playoff field
Sometimes bigger is just better and that might just be the kind of thinking that NASCAR needs to embrace when it comes to their championship format. Of course some fans are probably going to see this and think that doing so will over saturate the market with unworthy contenders, it also opens up more spots for smaller teams to have that Cinderella type run.
Maybe it will over saturate the market a bit, but the drivers in the back are going to start working extra hard to get into the playoffs. For example, NASCAR could expand the playoff field to 20 or 24 and then have one of the rounds be a double elimination. At least that would make things more interesting and thus more competitive for the drivers as well.