The P2P layer is part of the shell and is not amended via the onchain governance. Improvements to the existing approach are always welcome by contributing to the gitlab.
People are also free to work on separate implementations of the shell and explore different approaches to optimization while still remaining compatible with the existing shell. And of course nothing stops anyone from deciding they want to be incompatible and attempt to fork.
There is already an implementation in Rust underway whose motivation is described as:
The Tezos ecosystem will benefit from an increase in the diversity of its nodes (multiple implementations across a range of different programing languages & operating systems). It allows us to verify that the protocol is unambiguous. It keeps the door open for innovation and secures the honesty of all participants.
For more details see here.