In Diageo's defense, most of those distilleries listed were closed by Schenley in the 1960's and early 70's. When they became part of U.D. they really only had Dickel, Bernheim and Old Quaker. Of course U.D. made it a point to sell off Old Quaker and after purchasing Glenmore, they sold Yeloowstone and Medley distilleries and the bottling operation at the Glenmore distillery in Owensboro (the distillery had already been dismantled.) The closed Stitzel-Weller and has been looking for a buyer, but maybe not after purchasing Crown Royal.
The corporate philosphy at Diageo is short term profits to make the investors happy and no real plan to invest in the future of the brands or distilleries.