My question stems from seeing this post.
Normally, I try to discourage link only answers by either prompting the user to add more information, down voting, and/or flagging if the post is from a while back. The reason being that if the link goes down, then the answer is useless. But an SO link is unlikely to ever be down, unless the whole site is down, in which case nobody will see the answer to begin with.
So what to do about SO links? And what about deleted ones, and the majority of users will be unable to see them?