David Dein’s decision to hire the Frenchman ushered in an irreversible era of multiculturalism, giving birth to the Premier League we know today As feedback goes, even a character as relentlessly optimistic as David Dein might have considered the reaction to his bold managerial appointment suboptimal. Thirty years ago, Arsenal were in a state of chaotic flux, having sacked Bruce Rioch, with the interims Stewart Houston and Pat Rice in charge. There had been talk of Johan Cruyff arriving and Dei…