Wolfsburg’s Maximilian Arnold, Dante and Josuha Guilavogui  react after their side lost 5-1 to Bayern Munich in the Bundesliga, with Robert Lewandowski scoring five goals in nine minutes. Photograph: Michael Dalder/Reuters

One of the phrases we reach for increasingly often is football’s “bubble”. This is not in the innocent sense of West Ham and Upton Park; rather, it(...)