Web 2.0 has a major role in the work force. For those who are preparing to enter into the workforce, the web is a major resource. It helps potential employees to find jobs using online headhunter services. In the workplace, it helps connect employees in similar fields--it provides networking. The web allows for video conferences and makes communication instantaneous (email).
When the video says we'll have to rethink everything, I think it means that we'll have to rethink the role the web has in our lives. For instance, emailing is so much easier than actually mailing a letter through the post office, but is email appropriate for every occasion? That's what we need to decide. It's okay to email a relative you don't see that often, but is it okay to send out e-wedding invites?