Why should we care what one minor TV presenter thinks? Assuming that all Eliezer's direst predictions were true (and I don't have anything like the confidence in that that he does, but I presume from the post that you do), I could name a thousand people off the top of my head without even thinking very hard who it would be a better idea to convince of the risk.

I think what you're doing here is quite close to privileging the hypothesis -- "why don't we try convincing... this guy?" The amount of effort it would take to target one z-list celebrity for 'conversion', compared to the expected reward, suggests that almost anything would be a better idea.