As there is no particular owner for the bitcoin repository. But the bitcoin community can deploy the changes if required. The community as a whole can never be forced to adopt undesirable changes to Bitcoin protocols. Anyone can submit a BIP(Bitcoin Improvement Proposals) that aims to change the bitcoin core. The BIP must be approved by an editor.
The BIP must be voted in with 95% confidence from the miners. The community must upgrade to the new software version.