There is nothing "dying" or "stagnant" about the sector, which has seen explosive growth in the past ten years.
In fact, economically healthy centers like Denver and the Twin Cities are now overcrowded. There's been hypertrophic growth -- a very sharp and necessary correction is on its way.
Amazon's role in what will transpire is much more complex than your surmise about appy-fappy excitement to come.
By leveraging its clout and market-backed power (if not its own broken business model), Amazon may exercise vast power over distribution. That in turn has significant implications for the bottom lines of farmers and particularly for the types of smaller natural and organic growers who supply Whole Foods. Walmart has already beaten it in this area, but in a business with the thinnest margins there is always room for more degradation of labor.
By moving toward AI-driven workerless stores, Amazon can accelerate the pace of job loss that will soon swamp the retail sector with far-reaching social consequences. Even a public subsidy-dependent utopian like Elon Musk worries about what that will bring.
More generally, Amazon will be in a position to introduce to our food chain the types of values that have made it a hellhole for its domestic employees as well as a prime mover in the sweatshopping of the world. It's hard to imagine a more Stalinist corporation in the west, though Google
certainly competes.
And lastly, expanding monopoly power will lead inevitably to more regulatory capture. One day, that free cantaloupe of yours may be swimming in carcinogenic pesticides yet be called "naturally grown" (and heartily recommended by the in-house food writer at Jeff's WaPo).
Eat up. I doubt you'll know the difference.