I've always said that in the back of my mind, the most successful grocery store would be the 'walls' of the store -- bakery, deli, produce, meats, floral, cheeses, dairy and having a little selection of store brands in the middle where consumers can pick up (and vendors can pay a premium for endcap space, because they're the only non-branded products out there), with the rest of the SKU's behind the walls of the grocery store in a fulfillment only model.
Kroger should have pulled a Wal-Mart and turned to their shrink-heavy stores in urban centers to online fulfillment only -- basically only their delivery drivers can retrieve items for an order, and everything's shopped by an associate (Look south of the MicroCenter in Dallas if you want to see what one looks like: it still has the Murphy USA in the parking lot and is basically an unbranded walmart building with 'driver' and 'associate' entrances -- and then deployed the robotics there: less retail space, more online/fulfillment capacity (have humans grab produce and custom sliced/packed items, robots pick the dry goods), and while you lose some cashier jobs, you'll probably have net improvement in terms of time waiting to be picked.