The Hive community was able to unite and organise against the aggressor because it had uncensorable means of communication built in on-chain.
The first thing an attacker of Ethereum will do it censor all opposition on all centralised communications platforms - cut the enemies lines of communications.
I doubt Ethereum will be able to do what Hive did.
Nah, there are plenty of channels for communication online. The Hive fork was planned among the top witnesses on Slack, email or whatever.