Coca-Cola rival shares big news on three canceled soda flavors
These popular flavors may disappear from store shelves forever.

Usually a product gets removed from shelves when demand falls. Every inch in a grocery store is valuable, and products that don't move lose their spots.
Companies tend to stay ahead of this because they don't want to lose that shelf space. That's why many snack or beverage companies introduce new or seasonal flavors.
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When people get bored with Double Fudge Oreos, the cookie company brings out Strawberry or, for some reason, Selena Gomez. The same happens with Coca-Cola and PepsiCo.
Both companies want to claim as much shelf space as possible. That's why they rotate out flavors and bring out new ones.