Just because Cameron may play CF, doesn't mean Jacoby would be traded. He would be moved to LF. No way they trade their starting centerfielder, leadoff hitter, and stolen base threat just because they signed Cameron - in addition to Buchholz. They can stick Cameron in left too.
I'm assuming it's Ellsbury in CF and Cameron/Hermida in LF. I don't know if they would trust Hermida being an everyday player.
Unless the Sox can turn Jacoby/Kelly/B Prospect into Adrian, I don't see him being traded.
With that being said, an OF defense of Cameron, Ellsbury, and Drew is unbelievable.