I don't think the problem is retailers who are unwilling to accept Bitcoin. The problem is Bitcoiners who are unwilling to spend their satoshis! Even at a German retailer for Bitcoin miners, only 5% of customers pay with BTC! Most Bitcoiners ignore the fact that Bitcoin is supposed to be a cash system and misuse it as a store of value!
Discussion
That's why you convert everything into Bitcoin so you have no choice but to spend it.
This is the way
It's just about education.. at minimum, it is nearly seemless and free to buy Bitcoin and pay with it instead of fiat (thereby exercising the Bitcoin payment rails, while also not touching the stack. Also keeps it clean from a tax perspective until that gets changed too.