This scene has been on my mind, and I've been wondering if this is the first time that Jacob ever touched Ben. If it is, will Ben be affected by Jacob's contact as we are to assume that the lives of the Losties that he touched were? Granted, Jack didn't seem to become any less of a tool after his encounter with Jacob at the candy machine, so I wouldn't expect miracles with Ben here. But since for whatever reason Jacob had withheld his presence from Ben, the gravity of this first contact could be a very profound one on such an attention hungry man. This could be the final straw that wrecks Ben's last good nerve, and becomes the release valve that blows the pressure that's built up in him after a life of working very hard on things that perhaps he never understood at all.
So it brings to mind the question of what's in store for Ben in S6. There are no take-backs when you bludgeon someone, Ben could stumble back from seeing Jacob callously kicked into the flames and feel that he made a terrible mistake. Or he could whip around and finish his stabbing spree on Not-Locke out of insane anger at being used for yet another killing. Maybe Jacob's phoenix spirit will whisper to Ben, the way that Obi-Wan whispered to Luke, that it's better this way. But Luke didn't kill Obi, so who knows if Ben can come back from the dark side after murdering the man he thought was his hero.
I'm very much looking forward to seeing how this event will effect Ben and what he will do next. But my imagination is leaning towards seeing the act of killing Jacob completely cracking Ben's mind under the weight of all his previous evil deeds, and then he lives the rest of his life mumbling and playing Connect-Four with Lenny at Santa Rosa.