Theoretically, as you implement the system, you have the opportunity to improve your processes. You will outline the current process, add the requirements of the standard and then optimize the process with input from the process users.
Increased Quality Awareness
Theoretically, as the system is implemented, quality awareness will increase because all staff must be trained on ISO 9000, staff must be trained on processes as they are implemented and staff will have "ownership" of processes they are involved in developing and improving.