It's too early to say that definitively, imo.

As a counterexample to the DAO hack, the parity multi-sig hack of 2017 resulted in over $160M worth of ether being frozen on-chain. There were calls to hard fork Ethereum to return it, but the hard fork was never tenable. That was barely a year after the DAO hack and fork.

Personally, I believe there is a zero chance that a hard fork based on Tornado Cash becomes viable. It's not nearly a big enough issue for enough users to care (and exchanges, and wallet software companies, and stakers). Why would the 90% of users who don't use Tornado Cash risk helping the other 10% perform some fork, knowing that the fork would add fuel to the mutability argument and set more precedent for mutability?