There's no value in trading Soria at this point. The best they're going to get for him if he's hurt is a C prospect.
Best case if you really want to move Soria might be a short-term injury that gives Holland/Crow/Herrerra a chance to try out the job, and build the team's confidence in them. Then, when Soria comes back, he's lights out and maybe you move him at the trade deadline to someone who's desperate for a closer (Boston?)
"You gotta love livin', cause dying is a pain in the ass."