“Neeme Jarvi says his impending exit as music director of the Detroit Symphony Orchestra wasn’t strictly his idea. He also declares he’d be happy to spend several weeks a year with the DSO while a search committee headed by Anne Parsons, the orchestra’s new executive director, looks for his successor. With Jarvi starting his final season at the artistic helm and Parsons just settling in, the landscape around the DSO might appear to be shifting. But don’t expect sudden upheaval.”