I think the Stack Overflow guidelines have "solved" this problem in about the cleanest way currently possible: expect links to die, and include the relevant information in your answer.
If the link still works when it gets clicked on that's a bonus, but it shouldn't need to be available for the content you're reading to be understandable.
If the link still works when it gets clicked on that's a bonus, but it shouldn't need to be available for the content you're reading to be understandable.