You can buy the car you like with altcoins, in the United States some car dealerships may accept your transaction code. I think this is a great thing
The answer is simple, if you have enough bitcoin to buy a car, that can be done today. Car companies don't care what you want to pay, but the car dealer will accept / reject bitcoin payments. So, bitcoin can be used to pay for anything as long as the company receives it. If not, you must exchange it first into conventional currency then use it to pay.