Actually summer averages have supposed to been in the book for years. I was a delegate the year it was passed and our executive director spoke against the change. The summer still is not in the book and probably never will be due to printing schedules. They are listed on bowl.com now, as long as the secretary turns them in. I admit I normally don't to keep from having someone punished for a good week or two. Now I will have to turn those in too.
I think the big thing is if you run tournaments, and I do, we will have to write in the rules if we do not want to count summer averages now or you will have to really use your highest book. That highest now will include summer. I think this could have a negative affect on summer leagues for some bowlers. On the flip side as mentioned by others. I have seen summer averages 15-20 pins higher than winter. Is that because the centers juice up the shot in the summer to inspire bowlers for the winter, the shorter season or those bowlers let loose and really bowl because they know it didn't really matter.