DEMOCRATS FIND 'CUSHION'IS GONE FOR STATE BUDGET
NYS Dems, after yrs of charging that there are 'cushions' of revenues hidden in state budgets fashioned by Repubs, are now talking of bare cupboards as they prepare to assume power; coming state budget, 1st one in 16 yrs that Dems will propose, will likely be in need of $500- to $750-million in new revenues or trims in view of such legislators as Albert H Blumenthal, deputy leader of Assembly Dem minority, which will become majority next Jan; against such fiscal outlook, Gov-elect Hugh L Carey's chief adviser, former Mayor Robert F Wagner, is emphasizing that coming budget must be quickly taken in hand by Dems as their best opportunity to effect change; Wagner asserts 'best time to make changes is when you first come into office'; Alan K Campbell, Syracuse Univ Maxwell Public Affairs School Dean and member of panel of govt and fiscal experts apptd by Carey to help with budget transition, holds budget will be 'very, very tight'; investment consultant William H Donaldson heads transition panel; Wagner remarks that 'streamlining and savings' is gen goal (L)