Not necessarily majority - it's an interesting ability of capitalism over many other systems - multiple solutions to a problem can co-exist. As long as enough people still demand it to make it economically viable.

With "just walk out" the friction is extremely low. It might see less pushback than other technological approaches. However I have to think security will be a major issue. If I can rob the store by just leaving my phone in my car or leaving a cheap phone in the store while I walk away with the products. Tap-in/out gates are probably the best bet, but can still be tailgated, so you'll need to have pretty tight security and monitoring ready to beat anyone down who doesn't pass the checks or looks fishy at the gate or in store attempting to fool the system into believing they're another person. Or write those off as losses, I suppose most retailers today already do a lot of that.