See also the large amount of shelf space typically required to stock bottled water and soft drinks.
Is this a healthy relationship with what is, in the final analysis, an intoxicating drug? If there were an aisle in every supermarket with 10 times as much cannabis as you'd currently find in the average dispensary, would we regard that as equally normal?
I suspect you have not been in a dispensary recently if you think a supermarket would stock 10x as much; the range of products in most US dispensaries is truly enormous now across edibles, waxes, flowers, tinctures etc. I would strongly argue we would see a smaller range of products in the supermarket, should it become legal to sell there. This is exactly like alcohol too, where dedicated booze stores often have a wider range. It would still be significant in size though - lots of people like weed.