When you say crypto does it mean bitcoin only or any coins too? If you are referring to bitcoin then I think it is impossible because bitcoin has a lot of investors and it is growing every day. Bitcoin is very successful for many years now and it has established it's name already. I know anything can happen, it's the reality but if the price will go down it won't go as low as zero. On the other note, the only coins that I see that would go zero are those shitcoins who did nothing but just to ruin cryptocurrency image.