We were there Thursday morning when Starbucks' CEO , Brian Niccol, walked onstage at The Glasshouse in New York City ,  declared, "Our plan is working," and unveiled the next phase of his effort to engineer a comeback for the coffee giant. Niccol, a turnaround champion known for his successful  comeback campaign at Chipotle , received a round of applause from the investor audience while Panic! At the Disco's "High Hopes" played in the background. The " Back to Starbucks " initiative, launched