To me, the big factor is that players today haven't had a life outside the professional rugby bubble to grow as people. I always hark back to the 1997 Lions tour and the number of leaders, capable of giving a team talk or motivating a side. In no particular order, you had Keith Wood, Rob Wainwright, Martin Johnson, Jason Leonard, John Bentley, Lawrence Dallaglio and Tim Rodber. I find there's a stark contrast between the women's and men's teams as to how they come across and attribute this to the women's greater life experience.
I'd love to see your (or Eddie's) evidence of this educational divide in leadership, for example a list of your top 10 captains of all time and their educational backgrounds.