Like the first answerer said, its hard to say, but what Benoit was doing before he died was about to become the ECW Champion and continue helping the younger talent on ECW. Considering he'd probably be in there for a year. I could of seen him heading back to RAW and be involved in the main event currently as a heel, which RAW desperately needs.
Eddie Guerrero, when he passed he was basically involved with Smackdown, so that being said i could've seen him getting sent to ECW to help push the younger talent as well, then he'd be sent to RAW after awhile of being on ECW.
Very interesting question.