It seems the NCAA could find a happy middle ground with the regionals. Perhaps the Top 8 times / throws / jumps in every event(of the current season) leading up to the regionals receive automatic entry into the NCAA Championships. The regionals, much as they do now, would then determine who else can participate. The Top 8 would not be exempt from any preliminary heats at the championship meet but only that they would not be required to compete in the regionals. This way you get the best athletes yet leave open the opportunity for more individuals and teams to participate.