I think that as a trend, difficult personalities will have a harder time succeeding in any public role... Business, entertainment, politics, the arts. In the world of Twitter and Instagram, basically any disgruntled employee or collaborator can greatly damage reputations by sharing their experiences. It will be interesting to see how it unfolds, because as humans, I think we are drawn to celebrity, to authorship, to hero worship, to the "great man" theory, but that is obviously somewhat in tension with a world where every employee has the power to launch an effective protest movement from their phone.