The market can not collapse, you believe in it, never worry and panic and always remember that this is only part of the system and often happens instead of worrying that we need to think better. We can do when the market crashes.
it depends on which market you are talking about. bitcoin can not collapse because it has real world applications as a currency and as long as it keeps that it will stay strong and grow more.
but altcoins for instance are purely based on speculation and speculation can not keep something alive when there is no real world usage for any of them. eventually they will all collapse and disappear. there are about 1600 altcoins now and there has been about 4000 altcoins that have collapsed and died in the past few years.