The 20% threshold, as documented in the FAQs for instance, 800 * 0.2 = 160 of Nouns tokens, is not a small number comparatively in terms of the market cap. This translates to approximately 160 * 30 ETH * $2,000 almost equivalent to 10 million worth of USDC. For members wishing to dodge bad/undesirable proposals that arent going to be vetoed, its likely this will not materialize where the proposals get executed long before the threshold could be met to initiate a fork.
Consider conditionally reducing the threshold given that ragequit (or quitting) is going to happen regardless of the size of the fork. It is the forking group that could share the same goal and direction in a new DAO that matters.        
