They don't.

They can’t convert it without finding another person that wants bitcoin. So they are using bitcoin to get what they want. Your negativity can’t stop bitcoin.

> finding another person that wants bitcoin Apparently exchanges exist. That's where the fiat price of Bitcoin comes from that you're drooling over every day. "Bitcoin payment service providers" will even do it for you behind the scenes so all you ever get to see as a merchant is fiat.

How do they pay their suppliers?

How stable are their Bitcoin prices?