Not entirely, chas ... there have been several occasions recently where I was looking for a certain product ... did an online search and find out that So & So sells it ... go to So & So, ask for the product and get told "Oh no, we don't carry it, it's only sold on-line" ...
The stores have contributed because it is cheaper for them to stock it in one place and send it out when purchased than to stock some in several different stores ...
In fact, with one recent item which I could only purchase from So & So's 'on-line' store, they delivered it to my local store and I did not have to pay a shipping charge ...