It was removed due to cost and caffiene being more stimulating, and addictive. Looming regulations also played a part.

The amount in cola, or in any generally unrefined state, aka, not powder, is highly unlukely to have any psychoactive effects.

Unrefined coca is less stimulating. Seeing as refined cocaine was being used in products marketed to infants and children and well understood (by professionals at least) to be fantastically habit forming, I think the pivot to caffeine was somewhere between 99-100% influenced by the impending narcotics regulations.