If either Perry/Bachmann/Santorum dropped then Newt would be up by 10. They're killing him.
I think you're mixing up cause and effect. I think they're only so high because they're grabbing pollers who are fleeing Newt as he gets beaten up by conservative pundits and attack ads and need some destination. And I think people may have wildly misinterpreted the effect of the last debate that was deemed to be a coup for Newt. That assessment came from pundits who already knew about Newt's personal life but probably a lot of Republicans had no idea until they watched that debate.