"Online sales rose 8 per cent to $2-billion in Canada in the year ended April 1 – and are expected to increase 20 per cent annually until 2020 – while grocery sales in physical stores are in decline. Those latter sales dropped 1 per cent to $103.5-billion in that same period."

So, with a bit of ingenuity, the brick-and-mortar stores could increase sales by 1%.  Would you rather have 1% of $103.5 billion or 20% of $2 billion? 

Of all the grocery retailers Amazon could have pursued, Whole Foods is the worst.  Overpriced everything, marketed to millennials on the premise that organic is somehow better.  No proof of that, and in fact, you're more likely to get bugs, blight and undersized produce at an organic store.  Strictly sucker bait.