It won't be a hard fork, but rather a soft fork (new rules are a subset of old rules) with possible chain split, if majority of miners do not follow BIP110. 110nodes will follow a different chain unti...
There probably won’t be a re-org either because BIP110 never gets a majority of hash power, or because a re-org is simply prevented with a URSF/checkpoint/whatever. (Or both.)
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