You are right there is friction for customers to acquire bitcoins. My post was meant to expose the advantages for merchants, for whom there exists practically zero downsides (as opposed to customers.) But again I am not suggesting "forcing" customers to pay with Bitcoin. I am suggesting to add it as an extra payment option.

That said, it is becoming easier than you think to purchase BTC. There is no need to wire money anymore. In the US bitcoins can be purchased instantly with a credit card via Coinbase, as easy as signing up for Paypal.