Anthony Tommasini is impressed by the glare and glitter of Baz Luhrmann’s Broadway Boheme. “Yet from a musical perspective, many veteran opera buffs will be dismayed, as I was, by the compromises the production has made. Newcomers to opera who think they are experiencing the real thing are not. For all the dazzle and heart of this Broadway “Bohème,” I sat through three shows (to see the three pairs of rotating leads) getting more and more glum about the future of opera. Will traditional companies that play by the rules be able to keep up as the public embraces amplified opera on Broadway?”