The big TV story in the fall of 1971 was that movie stars were coming to the tube, including James Stewart, Henry Fonda, Shirley MacLaine, Glenn Ford, Anthony Quinn, Rock Hudson and Tony Curtis, among others. Many of them turned to TV because movie roles were growing scarce, and for lucrative paychecks. But the vehicles they chose were garden variety TV — family sitcoms and cop shows — and viewers tuned out. We look at the highest-profile failures — “The Jimmy Stewart Show,” Shirley MacLaine’s “Shirley’s World” and Henry Fonda’s “The Smith Family.”