Probably not everyone but I believe many of us here on nostr will stay and keep building for Bitcoin because it is the function that matters more than the value. But I guess it also depends on what caused the value to drop 90%.
Also, knocking 90% off is leaving 10% on, so it's knocking a zero off. So $60k = $6k... what we had 5 years ago (or even 4 years ago). I think many will be buying "the" dip.