Who will have the last shot in the spamming war?

Adfreak references an article that announces IBMs new tool which spams the spammers.
It basically sends all spam back to its originator. But, as Adfreak rightly assumes, this will probably just result in a huge trench war…
And honestly, can this program really differentiate between actual sender and possibly faked email addresses? Will innocent people be spammed, because people hijacked their email addresses? This should better be sorted out…