Rumblings and discomfiting whispers about the denseness and arcane programming choices of modern dance concerts have been percolating for a while. Recent real-life whispers I’ve overheard verify what I’ve long understood: modern and contemporary concert dance are not populist forms and, face it, they never will be. Like contemporary classical music or abstract painting, they’re for a rarefied few who appreciate design, music, movement, conjoined together into a collaborative whole. But without the cheesecake, soft-cell sex and glitter of “Dancing With the Stars” or even the “everything is beautiful at the ballet” glamour and glory of “Swan Lake,” modern and contemporary dance will never make it big.