Come on, you say it as if every board member is an android focused only on short term results. They've had a board when Eric was CEO and Google was doing it's best work as well.
It's not really about the board, Google has become a mature company that's not going to grow 20% YoY anymore and this is what happens to such businesses. Unless they're lead by an exceptionally strong person who can stand up to economic forces, they will turn them into IBM.