So far in human history, most authority was ultimately based on violence. Policing in the real world requires violence (not necessarily of the physical kind). Policing by a violence monopoly is the basis for governance and for the enforcement of rights and obligations like property laws or contracts and the punishment of transgressions. It seems to me that digital decentralization cannot solve this, but only cause further fragmentation (as explored in science fiction books like Freedom™ or Snow Crash). The world is already multipolar, does it need to be more fragmented? Rights, justice and other concepts are of course just abstractions, but will the world be a better one where the lines between actors are even more blurred? With clear hierarchies, planning becomes much easier. Are governance and other complex processes like public research and development even possible without some centralized financial and political authority?

I don't know what indicator you can point to that suggests a decline of authority. The internet may give you a sense authority is being "questioned" (a fairly passive form of resistance) but that's been happening since the beginning of human hierarchies. Rest assured, no authority has actually been lost.