Is your friend one of the bitcoin OGs? Does he has a large bag that can take good care of him and his family for the rest of their lives? If not, it's a dumb idea to discontinue his business. Accumulating Bitcoin cannot stop someone from running a business or working for other persons.

Also, going all in on Bitcoin is not such a smart move. It is good to diversify ones investment on stocks, real estate, gold, etc. incase it goes south, you will have others to fall on.