Pat LaPoint has an interesting perspective on the future of Market Research. I've wondered the same thing myself.
Since I started working in measurement and market research, we've essentially seen phone surveys come and go as viable sources of information, and my prediction is that we will see the demise of the email survey as an effective measurement tool within the next five years. And, while I agree with Pat's point about biometrics and marketing mix modeling, I wonder what will be available for the small to midsize companies? Maybe that's where content analysis will provide the answer.