I dunno. I was under the impression that New Coke was an unmitigated disaster. Coca-Cola Classic (then just "Coca-Cola") was already the dominant soda when it was introduced, and I don't think they picked up any market share in the months/years after the introduction of New Coke. But they did spend a ton of advertising money on the new soda which failed spectacularly.
New Coke was fantastic for Coca-Cola. Coke was on the decline while Pepsi was on the rise. New Coke was an attempt to reinvigorate the brand and get people drinking more Coke again. It succeeded accidentally, as people decided they liked Coke as it had been, leading to a resurgence of sales.
