I enjoyed your post. I am in total agreement and I think that there will inevitably be a rubber band effect in the industry. We can't continue to go bigger. There will always be a market for the big beers, but I hope we see more sessionable beers. I would probably put the cap for the "session" label at 4-4.5%, but that is a minor niggle.
Another problem, which you touched on, is pricing. I just picked up a sixer (while I was waiting for my wife to let me into the house...) and couldn't help but notice the odd pricing. I am in Denver and there were six types of New Belgium available at the liquor store. They all varied greatly in abv and hoppiness, but they were all the same $9.49 for a six pack. I went for the Blue Paddle Pilsner as I just finished my bike ride and wanted something sessionable, but it is crazy that it was the same price as the tripel and the belgian IPA. Are they worried that no one will buy the big beers if it is $8 for the Pils and $11 for the tripel? Even so, it seems like we will inevitably see more low alcohol beers as NB must have better margins on the Pils.