I think he is likely referring to complacency and a tendency to believe that risk has pretty much disappeared. If you look at a wide variety of asset classes (everything from treasuries to junk bonds to equities), prices seem to suggest that it will be nothing but smooth sailing for years to come. The chairman is suggesting that this is perhaps not the wisest thing.
"Neither my companion or I carry firearms on our persons. We depend on the goodwill of our fellow man and the forbearance of reptiles."
- English Bob