I think most "rack rates" on most items take into account that the item may go on sale.
"Loss leaders" has been around for quite a long time and are intended to bring you into the store. The goal for the store is that you do the rest of your shopping there. For the most part this works as most people do not like going from store to store.
That being said, prices have been rising long before the series on TLC.
So what you are seeing is a correlation, but not a causation. The rising prices were rising due to other factors.
What may change is that as more people learn how to use sales to stockpile, stores may adjust how they offer loss leaders and what limits they may set for purchase or coupon redemption. Some stores get around the "per order" deal by having a "per day" limit on an item. This too has been around before the series.