Digital signs and apps are what they're pushing on us now. There are already restaurants that don't have any kind of printed/posted menu at all and you're expected to use your phone to scan a QR code. There's no telling if the prices shown to you on your device are the same as what the person behind you in line will see.

There are also already restaurants that have different prices when you use their app which helps condition you to accept that prices will differ from person to person or even day to day.

You're right that people don't care for discriminatory pricing though. People's objection to the practice is the only thing that's been keeping it from being more widely used already (https://link.springer.com/article/10.1057/s41272-019-00224-3)

They stand to make money hand over fist from it though so we're going to see company after company testing it, pushing the boundaries of what we'll accept and normalizing the practice. Without regulations making discriminatory pricing illegal in certain settings, it's basically inevitable that we'll see it more often.

They would probably be able to do it if the listed prices were fixed, but they provided a personalized discount that would vary depending on who you are.

Well of course, except the menu prices are the "max" and everyone gets varying discounts depending on their profile. Just like at your local auto parts store, basically nobody pays "list price", yet it's there for the odd walk-in cash sale who doesn't know how these things work.

Maybe? Supposedly there's a McDonalds out in Denver's that's removed it's inside digital menu boards. Kiosks only.

https://kioskindustry.org/mcdonalds-kiosk-counterless/

Not sure how much of a trend this is though.