I understand that Disqus wants to make money, being a free service and all, but going behind the back of its customers is not the way to go. They really need to find a better business model. You can opt in for placing ads with them and share the revenue, but that doesn’t seem to be enough.
For a long time I’ve been using Ghostery to block web trackers and it has worked like a charm. I’ve written a post a while ago about essential plugins for Safari, including Ghostery that really makes Safari crash proof and you get the added benefit of not getting tracked while surfing. Go check it out.