Like all things in life, when its implemented well it works and when it does not it is terrible. I still think there is room for this to be the future though. I say this as a westerner but perhaps the west is not ready for it yet but I really enjoyed the experience of using QR codes in China. Go to a restaurant I just get shown where to sit and don't need to waste time with the host/server giving me menus or telling me anything. If I have questions they are there to answer the but I can also just sit down, scan the QR code, menu opens up and I can order food. Food just shows up minutes later. When I am done I go to the front and pay with Alipay.
The benefits to me of not having physical menus is huge. From the business perspective there is less interaction time necessary to serve a diner. Sure if this is an upscale high touch experience physical menu is where it stays BUT the majority of dining experiences are not like this. The menu is up to date and easy to modify. Possible to include multiple pictures and information about the food.
I might be wild but I really like the experience and wish more places would adopt it. Like all things I think here in the west its still too new so we have a mixed bag of good and bad implementations. Give it a few years and I think it will be narrowed down to the POS providers who offer it as a feature.