Granted, Lincoln Center draws upon a continual flow of foot traffic along Broadway; its lit-up buildings around a sexy fountain form a lure for passersby to visit and even loiter. Downtown Los Angeles cannot compete in the matter of foot-traffic density, and it’s late in the game to argue that the Music Center should have been built somewhere else -- Westwood, say, or Santa Monica -- from the start. Plans have been broached to turn Grand Avenue into a broad promenade for the arts, extending from the cathedral to MOCA and to California Plaza. If this pie in the sky should actually land, Mrs. Disney‘s wonderful gardens and the outdoor performing spaces and the cafes and restaurants could -- in your lifetime, if not necessarily in mine -- become a “music center” in more than just name.