I actually find a survey that says that stress is going down for CIOs a bit shocking. Maybe we're all just getting used to higher levels of stress -- stress is definitely not going down for the 'rank and file'. Or maybe it is the terminology of 'most stressful in your career', all those that lived through the last downturn probably have felt a bit more stress during those years. Like I said before though "maybe we're just getting used to it".
Maybe those who are really under stress didn't have time to take the survey?!?!
Since one of the great values and security issues related to big data efforts is the ability to derive behavior and other data, there definitely need to be policies.
On the other hand, not all data is created equally, so flexibility and a strategic context management approach needs to be developed. Since much of the more critical data may not be in traditional IT systems, IT organizations are going to have to listen, influence and justify any policies that span the corporate portfolio.
Remember that it is the business that evaluates the true value of the context generated by the data, not the IT organization.