No; if 'the majority of hashrate' was in some way or shape a coherent entity, they could take 5 minutes to write whatever code and run it right then and there.
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So, it would not be the a release from the Bitcoin core team, but a different brand of the Bitcoin Core software?
It in that case would not be a release from core, correct. It would not even have to be inside the client, they could run a seperate program to adds the additional softfork rule and enforces it by ignoring the now newly unvalid tx's...its janky, put possible.