- Their suppliers and employees want to be paid in FIAT. Since all of their suppliers want to be paid in FIAT.
- The market cap of Bitcoin is now high enough that one high-end product line won't move the price much.
- If successful, they will run into Bicoin scaling issues.
It's important that producer have excessive amount of cash flow so they don't worry about the fiat payment for the latest 5 years for that special part of their product line
Imagine an extreme case: Apple with their hundreds of billions of USD in cash account have one of their best high end retina screen mini tablet only payable in bitcoin, what will happen? Clearly, Apple is going to make huge amount of profit due to their sale could push bitcoin price by at least one magnitude. And all the other manufacturers will follow
For scaling part, that might be a little bit tricky. I think as usual, they will rely on some large wholesalers in each country to distribute the product, so one transaction per month is enough for them. And for the wholesalers, they could use several offline transaction hub nodes for small transactions from individual buyer