You're right--I was a bit shortsighted there. But, it won't necessarily mean that the link was in the post--it could be in the comments, as well.

Overall, though, I hope that the effects are good instead of bad. I love pingbacks, I love stats and graphs, I love seeing where I get linked to, and I generally don't get too overly concerned if people link to me in a post I can't see. I think this is going to give value to the silent lurkers to paid users, as well, as people realize their posts are read more than they thought.