Here are a couple of quick thoughts.
First, I question how many people come out to chase points. Maybe the top 5 in the points race but more likely the top 3 are all that are really concerned and attending because of the points. Thus, I doubt it will affect attendance much.
Second, you might increase attendance by someone who normally races 8 races a year and, in the past hasn't worried about the series because you can't miss a race and win it. We have some Masters racers who are in the top 3 in almost every race but only do 6 races a year. If they knew they only had to do a few more to win the UCA award they may come out and do that.
Third, the people who come to every race to chase points will likely come to every race anyway. This will allow them to go to other categories though and may make the other fields more competitive at times. For example, I would like to jump around some in the Pro 1-2 in some races and Masters in others.
Last, this award has turned into an attendance award in some cases. I would think that the award ought to be given to someone who can consistently place high in the races. If not, we ought to call it the UCA attendance award!