More people going to work want to be free to blog. If they can't morale will drop and talented people will leave. So companies need to develop blogging policies.
I think a blogging policy should be developed in partnership with communications teams and staff. It should be possible to create workable policies. A large element in this process is trust. If you trust your staff to talk and meet with customers, you should trust them to blog. Maybe staff should be licensed to blog on certain subjects. When I am invited to meet communications people from companies who want to develop their social media strategies they are often in a position where they know that some staff do blog even though the company does not officially sanction it. To me it seems a waste not to draw on the expertise within an organisation. There are probable many staff who could really contribute something to the value of the business by being empowered to blog on certain subjects. It would certainly create a buzz around the company.