If you say crash meaning it means something destroyed but i dont see or think that it would happen to bitcoin during SegWit2X, bitcoin price may fall down but i think at very slight decrease probably between $6.5K to $7K value. Most of the bitcoin holders are battle tested that they have already hard experiences with bitcoin during troubled times from SegWit, China ban, JP Morgan criticism and many others in which together with bitcoin they survived how much more of this SegWit2x? In which i did not see any difference from the former.