Non-circulating TRIBE is existing treasury (~300m) and staking rewards (~60m). Of the circulating TRIBE, (~300m) is timelocked in some form. This leaves (~340m) available as possible to ragequit. Assuming 100% of these ragequit there will still be several hundred million in protocol equity (and a huge treasury). This would be quite dramatic, hard to say what the real number will be but I expect it to be much lower than this.