Well then you don't have to accept it, but it's already widespread enough that it should be included, especially when privacy is less of a concern than buying drugs with XMR. I should note that the marketplace idea would be limited to legal items of course. Taler is cool, but not anonymous for both parties like XMR, I'm not saying don't use it, but add it to the list rather than use Taler exclusively. No reason to not take multiple forms of payment and each "store" could choose what it accepts all the way from mailed cash to live chickens (figuratively, idk how that'd work logistically lol).