It's a huge barrier and also they are suppliers. Whoever they buy their stock from probably doesn't accept Bitcoin, so they would need to convert it to cash.
Discussion
Yes, they would need to convert what they need for accounts payable (AP) instantly for (zero) 0 capital gains. Then only a % of profits not getting converted, but then thoses are in the books for capital gains later.
It's not reallyworkable currently in many places.