The biggest impact this could possibly have is in producing legislation that lets large donations conceal their source because of fear of hateful retaliation. Ironic I know. If we don't want to have those laws we need to be a little less witch-hunty about what we discover in the records.
I personally don't think there's anything "witch-hunty" about this boycott. This information about Eich's donation has been available for some 6 years, and only became a recent issue when he was promoted to the head of an organization based on community values and community contributions. I can guarantee you that the same thing would happen if someone who donated to Prop. 8 were appointed to the head of Wikimedia Fou…
Also it's one thing to cease doing business with an organization yourself. It's another thing entirely to try to incite other people to do the same using your notoriety as a tool for coercion.
Times change, people change, records do not. It's hard to explain what you were thinking and what was happening 6 years ago. It's easy to point a finger now and say, "look at what that asshole did."