Does the Historicity of Adam Really Matter?

I just read a great article by Michael Reeves at Reformation21 titled "Adam and Eve". He discusses (rather cogently I might say, but don't take my word for it) why the historicity of Adam would seem to matter (it impacts the doctrines of Christ, the Trinity, and sin, among other practical biblical concerns). I'd be interested to hear others thoughts interacting with the article (whether positively or negatively--but that means the article should be read if you are thinking to comment on it ;-)...