Why sell? That's so stupid! Unless you are in debt. If not, live a minimal lifestyle and enjoy your time with your wife and family. Living debt free and knowing how you're going to feed your family and pay to keep the lights on, because you have enough wealth to pay for your children and their children. If you wanna work to buy toys, go for it. But don't dip into the money that will sustain you and your lineage for the next 100+ years. Whether bitcoin is it or another coin is. Hold onto your wealth and live debt free and have the freedom of knowing, nobody has their thumb on you at work. You rely on no one to feed your family. Being in debt is a sin and it degrades man and his ideas. If you read any history even up to 100 years ago. People fled countries and killed themselves over minor debt because they had no idea how to pay it off once acquired.
Who puts all their money into one asset class?
I am a big believer in the permanent portfolio method.
You can live without debt and be diversified. That way you won't sell when the stockmarket crashes and you can gain the benefits that have been proven over time. You are buying a share of a business. There are dividends and distributions of real earnings.
There are no economic benefits that can be gained with bitcoin. You are better off investing in a bitcoin gambling firm or an exchange. Otherwise you aren't creating any revenue stream but relying on the fundamentals which could disappear overnight. High Risk doesn't necessarily mean High Return. In fact the most risky assets are the ones that have gone bankrupt such as Enron and they have zero yield.
You want a stable revenue stream. This can even be as easy as collecting a welfare check. You don't see people just holding gold and not collecting welfare do you? Who would give away something they qualify for. That would be ridiculously insane!
Furthermore, if everyone is selling, why don't you sell and get back in at a later date? Even if that is only $100 lower?