Could be, I'm sure they will try to do things discreetly by issuing a demand letter from their lawyers to his and avoid having any civil action formally filed in court, but I would be very surprised if they just totally decided not to seek some damages for their losses. They are already in a situation where he is being prosecuted criminally, why not throw a civil action in the mix?
This isn't some teenager experimenting with shoplifting pins from a park kiosk, this is a 24 year old adult who utilized his knowledge as a park employee to hatch plans to create false identification cards, and costumes, and coordinated an effort to take himself and at least one other individual into restricted areas and convert property valued in excess of $8000 to his own possession and then fence them on the apparently underground collector network for upwards of $29,000. Who knows if these reports are only the tip of the iceberg. Plus, he's been very publicly been taunting Disney and releasing images and content from restricted areas, to include release of what may be confidential work product (MMRRR plans).
Again, I could be wrong, but I think their concerns over sympathy for this guy are not quite what you imagine them to be.