I don't think it's about network share. Those are empty numbers that can be manipulated. It's about economically relevant nodes that originate high volumes of transactions (e.g. exchanges, swap services, etc...). If none of those entites are signaling BIP-110, the miners can't be bothered to care. After user activation, BIP-110 will immediately drop in hash rate and transactions will take hours or days to confirm at a safe depth. It will die so fast, and so many of these amatuer outrage-addicts are going to be even more confused and angry than they already are.