Implementing ETH 2.0 involves coordinating various groups of people to interpret and implement the specification, as Ethereum Foundation handles research in-house, while independent teams in different regions are responsible for the actual implementation. The process consists of two phases, phase zero and the merger phase, which involve the creation of a proof stake network and inclusion of the existing ETH 1.0 network into ETH 2.0, respectively.
The implementation of Ethereum 2.0 requires constant communication and coordination between the Ethereum Foundation and independent development teams from around the world. The process involves the creation of a proof stake network that is initially separate from the existing proof of work network.
In the native proof-of-stake launch of Ethereum, phase zero and phase one will have minimal functionality, and the proof-of-work chain will be left behind. The upgrade requires coordination, but it allows for the continuation of the existing system.