The piece goes on to list a variety of challenges that think tanks face, including gridlock in the US government which makes it harder to get their ideas heard, and TED talks. The full piece can be read here.
Think Tank Watch has long written about the challenges think tanks face in order to avoid becoming obsolete. In fact, a 2012 Think Tank Watch post with the same title (Are Think Tanks Obsolete?) can be found here. And from a Think Tank Quickies: Are Think Tanks in Canada Obsolete?