I think this is correct. And the poster equally identified this issue.

"Customers love it, merchants hate it".

But customers would drive adoption of any system, and why would they use this one?

Speaking as a merchant, I don't "hate" the fees. They're a cost of doing business (shrug). Like rent. It's just built into the price the customers pay.

And no, I'm not going to have things at multiple prices for different payment options. Life is too short for that kind of admin.

I think ultimately this is where all "payment disruption" falls over - they rely on customers changing, but customers are happy already...