Just because something is believed by a large group of people doesn't mean that it is true (At one point the world was believed to be flat, supported by Atlas, etc.). Today the concept of "learning" has been fairly misrepresented on many levels of education. Just as senseless traditions and myths have held mankind back, traditions in teaching (and learning) and myths of human memory retard the overall intellectual progress of the general public. Spaced repetition is not the silver bullet to this problem, but it certainly is a key component (At least I think so). I have started reading the book mentioned in this interview (Make It Stick: The Science of Successful Learning) within SuperMemo, I will post after I finish reading it and what new tidbits I find.
The interview here pretty much echoes the validity of a SRS-centric lifestyle. If you have been doing research on spaced repetition for quite some time, most of the details of this interview should come as no surprise, but it is nice to know that there is hard data to back up claims. At least you aren't believing something just because "it feels right."