A startling new report from an Illinois group reveals a near-total lack of planning on the part of arts organizations nationwide for replacing their top executives. “Three out of four non-profit arts organizations report having no succession plans, even though nearly three-quarters of their aging top managers say they plan to quit within five years.” And while it may be true that arts groups don’t have the budgets to carefully groom successors from within, as is the norm in the corporate world, the recent rash of hasty executive departures from orchestras and museums points up the lack of foresight.