BIP-110 supporters seem to think their proposal is special, yet it has even less support than several other soft fork proposals that wouldn't dream of activating without broader network consensus.
Come August, we'll find out whether that confidence was justified. My guess is BIP-110 fails, is quickly abandoned, and leaves its supporters looking far more arrogant than they realized.
Bitcoin in its current state with its current consensus rules is the default. There are all sorts of soft fork proposals that if their supporters tried to activate without widespread support would fail (e.g. BIP-300/301, BIP-119, BIP-340, BIP-54, BIP-440/401, BIP-360, & BIP-110).