Fed's Waller Says I See No Reason Ever To Be In A Scarce Reserves Regime; If Can Figure Out Way That Banks Don't Need As Much Reserves, No Problem With Shrinking Balance Sheet Accordingly; Lot Of Dispute How Much You Can Shrink Balance Sheet On Reserve Demand Alone; Task Force Will Think About How Seriously We Can Think About Reducing Balance Sheet; Have A Hard Time Seeing Where Balance Sheet At Current Size Is Causing Problems