Yelps move is reflective of a larger move that the crypto space has craved mass adoption. Whether merchants are rolling out ways to draw in customers or demand to pay with crypto is on the rise, this is clearly a good sign.
It's not necessarily just mass adoption.
Right now, I'd say that adoption levels for bitcoin as a
speculative investment are already quite widespread, while bitcoin's utility as a
currency is still yet to be proven. Mass adoption as bitcoin as a medium of exchange and long term store of value is what matters most.
Although it may incentivise more merchants into accepting bitcoin as a payment option to gain more attention, I doubt that this is an initiative that is going to all of a sudden drive people crazy into adopting bitcoin and pay with it, it's not like people who had bitcoin didn't know where to find bitcoin accepting merchants in the first place. Mass adoption is driven by much more than a single company's decisions, though this is obviously welcome one.