Depend on bitcoin is not a stupidity. Do you think that people who work in blockchain.info are stupid people, they are smart people who create online wallet for bitcoin users. They are rich and not stupid. People who spend all of their energy to help environment environment for bitcoin are know that bitcoin will make a revolution in world economy or atleast change on some habbit that too much spend money in transactions.
Firs question, did you know about bitcoin?
Second question, did you know about blockchain?
OP only insinuates bitcoin not blockchain, as you know bitcoin can be used as a place of investment, can be used as a means of payment and can be used as a tool to send money. I guess the OP only recommends that you don't just rely on investing in bitcoin to get profit / source income. You have to find other ways to meet their daily needs, so when the current price decline does not hamper their investment in bitcoin. As for blockchain, I guess this technology is not a place to invest while those who work on blockchain may have a steady income.