In as much as we all wish to help fulfill the dream of Satoshi Nakamoto in using BTC to make transactions in our daily lives we must look critically at the high volatility of BTC. Come to think of it people, how many of us in here would wish to purchase an item worth $500 US right now when this same amount of BTC was worth over $1000 US last year. If we are able to solve volatility issues with BTC then trust me the acceptance of BTC will go viral. I just wish there were some real holders in the cryptospace!
You are only looking at only one side of the volatility, in this case the negative side, if you buy bitcoin at 4000 and in a few years it is worth 20000 again now you can buy 5 times more stuff with the same amount of bitcoin that you bought, so while the volatility can go against you it can also be favorable to you and it is precisely at those moments when you should spend your bitcoin.