It seems like someone has used it, I've heard the news, that there are people who buy cars using bitcoin. it may be in the future bitcoin becomes a legitimate transaction money, but to make it happen it takes a process to introduce a bitcoin advantage program. we as bitcoin lovers should be able to introduce each other to friends who do not understand about bitcoin. with the bitcoin, our transaction gets easy use and faster in making payments, I hope bitcoin to be the originator for our financial system.
The problem with this is those people are still buying with fiat. The dealerships are in agreement with payment processors that instantly exchange the coins into fiat and even update the prices of the products every few minutes, so that the person buying will pay the right amount in USD or EUR.
If you buy something for BTC and the person instantly converts it to USD it's the same as if you converted it and sent him USD. The only advantage for you is you won't have to register and verify on a bitcoin exchange, but it doesn't benefit the currency in any way.