This will help with the pagerank spam problem on blogs, but, sadly, comment spam will absolutely continue. It's a prediction that I'd love to see be false, but, it won't be. To truly end comment spam we must do the following three things.
- Do away with anonymity online.
- Develop a central identity and reputation management system.
- Remove all the comment spammers.
Oh, wait...well, we can work on #2 , I guess, I'd be happy to key off of Slashdot's karma system. While #3 is too grisly for me to take part in, I don't think that any of us should be the jury of the person executing on bullet point #3, if you catch my drift. Finally, I'd miss anonymity, even though I only allow logged in users of blogger to post, anonymity is pretty important on the internet.
Our future has spam in it. Comment spam. Link spam. Pagrerank spam. Spam. Sigh.