"Tyler Cowen posits today that on economic issues, the right wing was both more dynamic and more correct than the left during the 70s and 80s, with "peak right" coming in 1989. After that, the left became more dynamic and more interesting. Obviously this is an arguable hypothesis, but let's put it aside for a moment to consider this:
The relative rise of the Left peaks in 2009, with the passage of Obamacare and the stimulus. From that point on, the left wing, for better or worse, is a fundamentally conservative force in the intellectual arena. It becomes reactive and loses some of its previous creativity.Over those years, right wing thought, on the whole, became worse and more predictable and also less interesting. But excess predictability now has infected the left wing also. Attacking stupid ideas put forward by Republicans, whether or not you think that is desirable or necessary, has become their lazy man’s way forward and it is sapping their faculties."