Saudi Arabia’s new advisory council could unravel quicker than Donald Trump’s. The U.S. president’s strategic and manufacturing panels, stocked with chief executives from companies like Blackstone, 3M, General Electric and Merck, lasted six months before being wound up in August 2017. Saudi Crown Prince Mohammed bin Salman’s 18-member group of foreign experts, brought in to advise on new super-city NEOM, may have an even shorter shelf life.Advising presidents and princes – or both in the case of ex-Uber boss Travis Kalanick – has two benefits. It flatters the ego of the bigwig who’s asked by serving as a kind of