"one organisation having the power to unilaterally dictate to everyone and expect people to listen to them"
In tech frequently a benevolent dictatorship is the only way to get things done. They could take this through the IETF or ICANN or something but they'd spend 5 years listening to people prattle on about edge cases while SHA-1 becomes progressively less secure. I worked with airlines for a number of years and the amount of effort spent trying to keep old devices alive on their networks FAR exceeds what it would've cost to just upgrade the devices.
In tech frequently a benevolent dictatorship is the only way to get things done. They could take this through the IETF or ICANN or something but they'd spend 5 years listening to people prattle on about edge cases while SHA-1 becomes progressively less secure. I worked with airlines for a number of years and the amount of effort spent trying to keep old devices alive on their networks FAR exceeds what it would've cost to just upgrade the devices.