The facts here are simple. BTC price is dependant on USD and it can be seen by merchants not willing to accept BTC without BitPay converting them right to USD. To those merchants, BTC is useless as a currency because it's not able to keep price stability. Only use they have for BTC is for marketing reasons and a possibility to lure in those who worship BTC.

Now, go, run boy. Buy yourself a brain and try to debate that.