By City AM reporter “If you build it, he will come,” whispers a ghostly voice in Kevin Costner’s 1989 film Field of Dreams. It’s a mostly-misquoted line that’s been used to drive scores of corporate and sporting turnaround efforts over the past 30 years. It speaks to a reassuring belief that if you create something good that works well, the punters will take note. Over the past four years, it also appears to have been adopted with some vim by those shepherding the City of London through its big capital markets makeover. London has been plunged into a crisis by a lack of fresh listings, an exod…