Big crash has already happened but not to all bitcoin users but to specific bitcoin users only. Those individuals were the individuals who doesnt trust in bitcoins and sold their bitcoins when the price deflation occurred. They didnt know that bitcoin will climb up again in value and will continue to climb up. So to the non believers of bitcoin the big crash in your investment has happened when you decided to sell your bitcoins at a lower price.
They can think whatever they want but for me I believe in bitcoin, I would be happy if the price will dump so I can still accumulate, for now it seems like bitcoin is going up consistently and it will make the doubters regret not putting their money to bitcoin.
Been holding bitcoin since 2015 and I am very much satisfied with the price now, but not willing to sell yet because more to come for sure.