Keep in mind it often has a much longer shelf life so the shelf space is not a good measure.* Also, my local store has milk cart shelves on wheels that can be restocked much faster than fixed shelves.
Tip: the same non dairy milk can be found a smidgen cheaper non refrigerated
At Costco, they sell box type non-dairy milk as room temp and shelf stable, while other almond and coconut milks are in half gallon form and refrigerated. Not sure whether the latter actually require refrigeration before opening.
In their market research of consumers, the same article found that many people are intentionally consuming less dairy.
...nearly one in five (19%) Americans claims to be consuming less dairy for health reasons.
[0]http://www.nutritionaloutlook.com/article/us-non-dairy-milk-...