The bond bubble is the one they are struggling with all their might to keep inflated .... if investors start to abandon bonds then the game is up, (interest rates will rise regardless of the illusion of control from any central bank).
Gold and BTC were beginning to present viable alternatives to the "safe-haven" bond holdings ... that the central banks are devaluing with their unprecedented fiat money creation.
The bond bubble is the next to pop and the crash will be spectacular.
We are at the nexus, debt or asset money, your choice?