This year, Vogue’s September issue is landing with a different kind of thud.

Anna Wintour named her successor as editor for Vogue’s prestigious US edition on Tuesday, but media and fashion insiders shrugged as the glossy faces declining readership — and relevance.

The feared editrix, the icy inspiration for Meryl Streep’s cold and calculating fashion editor in “The Devil Wears Prada,” handpicked longtime social media editor Chloe Malle — the 39-year-old daughter of actress Candice Bergen and the late film director Louis Malle — as the new head of editorial content at Vogue US. 5

Industry insiders noted that while Malle brings stability and some famous contacts, she doesn’t necesarily have the chops to grow the fashion bible’s business to counterbalance systemic readership losses in

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