Investors seem to have every reason to worry about bonds. Prices are high, yields are low, and low quality companies are accessing easy financing even in the face of an uncertain economic future. With all that said, there might not be any reason to worry at all. Central banks are still gaming the system. From the Fed being really conservative with rates, to the ECB and BOJ doing massive QE, the whole central bank mechanism is conspiring to prop up bond prices in a major way.
FINSUM: As long as that pre-condition of huge central bank support is in place, it is hard to see bonds taking much of a hit.