beambot, I agree with your comments and adjusted the title of my post and added on to the end of my post to give more context. Certainly not all guest blogging is bad (e.g. valid reasons for guest blogging include exposure, branding, audience, community, expert opinions, etc.). We just see a lot of spammers exploiting guest blogging and innocent site owners as an SEO tactic, so I wanted to make it clear that we reserve the right to take action where we see abuse.
It seems like all the legit reasons to link out have nothing to do with search rankings, so why risk Google's Ire?
More importantly, if No Follow becomes the default, wont that be a net negative for Google's index?