Which of the following pair of thinkers denies the idea of 'Decline of Political theory' ?

Isaiah Berlin (who argued that political theory will never die so long as human beings disagree on ends) and Leo Strauss defended the continuing vitality of normative political philosophy, whereas David Easton, Alfred Cobban, Peter Laslett, and Robert Dahl wrote on the 'decline' or 'demise' of traditional political theory.