This episode's headline: Debate Without End; Abortion Violence; 1984: Year of Plenty; Touching a Chord; Time For Thought. The guests include In New York: FAYE WATTLETON, Planned Parenthood; ROGER ROSENBLATT, Time Magazine; In Washington: JUDIE BROWN, President, American Life Lobby; In Detroit: SAUL HYMANS, Economic Forecaster; Reports from NewsHour Correspondents: BARRY MITZMAN (KCTS-Seattle), in Everett, Washington. Byline: In New York: ROBERT MacNEIL, Executive Editor; CHARLAYNE HUNTER-GAULT, Correspondent; In Washington: JIM LEHRER, Associate Editor