Fork wold decrease number of miners working on the main chain. Thus destroy some value, and bitcoin price may be more volatile in days of fork. But no more than

Fork wold decrease number of miners working on the main chain. Thus destroy some value, and bitcoin price may be more volatile in days of fork. But no more than that. I cannot imagine any exchange/buyer accepting transactions from anything but the longest chain, and existence of the longest chain cannot be kept secret in modern world.