I hate when companies don't innovate in an effort to protect old business models. That's why we're stuck with so much backwards services and the only innovation comes from mobile apps.

More often than not it will bring more people to your grocery store who would otherwise not come. Plus they are coming to the store already so it's incentivizing them to come in and buy other stuff while they are at it.

Sadly most companies wait until it's too late when they are being eaten by competition, while they were busy worrying about 'cannibalism'.