Your idea is very good, but using bitcoin to buy things is something more difficult. I will give an example of my case. I'm not a miner, that means for me to have bitcoin I have to buy bitcoin, right? so I take $1000 from my bank account to buy bitcoin, guess what amount of bitcoin i get in my bitcoin wallet? I get  $800 in bitcoin. That means I lose $200 because of the fees.

so if a coke costs 5 $, what would be the best option for me to have coke? buy coke with my bitcoins or buy coke with fiat?

I will buy coca cola with Fiat and my bitcoins will use to hold.

Most people may want to buy things using their bitcoins, but they can only do so if they are miners, casino owners who accept bitcoins as a means of payment, exchange owners, mixer site owners or some investor who buy bitcoins and make a lot of profit