Saylor, who calls himself a crypto guru, believes that bitcoin is a one-time change in life.
calls himself a crypto guru

I don't understand what he means by bitcoin "one-time change in life"?
Is. He also advises everyone to convert their cash into bitcoins.
and after people convert their money into bitcoin what will they do? hodl to make 10X profit what if they buy and the price drops a lot? not all people have the patience and brains to deal with losses in a way that is not radical. I think he should be careful when giving this kind of advice.
Yes, I have the same worry as you. Beginners may not be able to withstand short-term fluctuations, in case of a loss, it will have a negative impact.
Friends who are interested should be advised to learn more about Bitcoin, what is its charm and so on, instead of buying it.