I agree with the author that there has been progress. Oddly enough, the more important philosophy becomes, the more invisible it is to people -- even the people making the progress! The ideas are the air, the questions are being asked, and leading practitioners, many times simply from being part of the environment, pick up the conversation in a much better place than they would have, say, 50 years ago.

The interesting question is the reverse: where has the progress of philosophy failed or gone backwards? (I imagine asking and talking about such a question would be quite controversial!)