FISCAL OUTLOOK HELD GRIM FOR NEW YORK
Gen Acctg Office repts to Cong that NYC's fiscal and econ base is continuing to deteriorate and that prospects for halting trend 'are not bright'; cites burdensome taxes and unemployment; holds that because of econ decline and continuining 'uncertainties,' city may 'fall short' of goal of having balanced budget by June 30 '78 (M)