CAN security challenges

Thesis  on A Novel Technique for Sample Point Discovery and Its Use in a Proposed Broadcast Confusion Attack on High Speed Controller Area Networks by Brendan Neil Mulholland is available on Proquest.Thesis Advisor: Professor Zachary Estrada 

 "Networks that employ switches and routers use information contained in higher layer packets, taking the data contained in those packets and generating new higher layer packets. But with CAN, the raw signal on a shared bus is the information upon which all devices act."

With switches and routers getting smart and adding to security, will CAN too need such an intervention?