In cases where one monopoly ownes all the "competing" products boycotts obviously fail. But A-bush does not have a dominant lineup of beers. The boycott is too easy, and brand loyalty is very high. Once people switch to another beer they will stick with it out of habit. Most of those customers are not coming back, and they legitimately switched to a different company rather than a diff beer from the same one. If any backlash has staying power it's this one.