"an intense and widely shared enthusiasm for something ..." Yes. "... esp. one that is short-lived and without basis in the object's qualities" No. I explain

"an intense and widely shared enthusiasm for something ..." Yes. "... esp. one that is short-lived and without basis in the object's qualities" No. I explained why. Also, Apple did not do it first. Google, for one, launched "flat" redesigns prior to iOS7.