Sorry if this has been asked before but I couldn't find anything mentioned in my search.
I'm wondering if there's a way that we can prevent dead-links form forming as accepted answers? I found this question ASP.net MVC returning JSONP which is a reasonably popular question and a common problem.
The accepted answer just leads to someone's blog, which has a high quality blog with lots of really useful detail. There was a period however where this link was dead, based upon the comments at which point the community lost a great answer.
So the general question is, how should this be dealt with? Should the entire contents of the blog be copied into the StackOverflow answer? Should we try to extract the useful sections (which in this case, most of the blog is required) or should we leave links there as answers and let them slowly die over time reducing the quality of StackOverflow?