Great explanation. Thank you. So it is not automatic just as I said it will be, but it was close. So merchants can do these I wonder why they won't? Maybe because crypto can still bounce up and down in a week?
It is fully automatic in case of Bitcoin payment cards
But in this case you just pay with your Bitcoin card in the same way as with any other such card, and whoever you pay to may not even know that you paid with crypto. Obviously, this has nothing to do with merchants knowingly willing to accept cryptopayments. Regarding accepting Bitcoin payments online, there is simply no demand for such payments as explained in the OP. And that's the root of the problem
Really, given that you can easily integrate cryptopayments into your shop and the payment processor guarantees you real-time exchange rates (this is not a big deal), every merchant would readily add this option if there was massive demand for such payments. Further, you receive the bulk payment at the end of the week but the conversion rates are determined real-time, i.e. when a client actually pays (not at the end of the week, as you seem to assume)