What happened to the arts on TV? “Even in this niche-rich era of digital cable and the baby satellite dish, television doesn’t have a lot of room for plays, dance or serious music, let alone literature or the visual arts. PBS schedules less classical music, jazz, theater and dance than it did a quarter century ago. ‘CBS Sunday Morning’ is the only regularly scheduled program in the whole of network TV that gives the fine arts the time of day. A&E, which was ARTS and then the Arts & Entertainment Network, is keener on E than A these days.” So what’s the reason?