@hawkeye10,
Whether it has affected sales really couldn't be determined yet. It would take considerably more time to ferret that out. This is a major company, doing business on an international scale, and selling a variety of products under their brand name. To what extent, if any, this boycott has had any effect on their over-all sales world-wide would require analyzing multiple variables over a considerable period of time.
But it has already achieved a more important goal--it got people to pay attention to the gay community, as a consumer group. And it got the Barilla CEO to meet with representatives of LGBT groups in Italy and to listen to what they had to say. Whether this results in a change in Barilla's marketing practices, or the type of "family" they promote in their ads, remains to be seen. But the Italian LGBT community demanded, and got, more respectful treatment from Barilla than his initially dismissive comments had indicated. They presented themselves as a force to be reckoned with, and that alone is a major accomplishment.
I think it also has to be considered that this whole issue is probably more important in Italy than it is in the U.S. because the LGBT community there has gained even fewer legal protections, and legal rights and privileges, than they have here, so the seeking of influential supporters, like Barilla, to help change Italian attitudes, is even more important there. And, as a practical matter, the Italians consume more pasta, more regularly, than we do here, and a boycott of Barilla in Italy might likely have a more dramatic impact there.