The whole age thing has been overhyped. Some of our older players will move on at the end of the year i.e. McDonald, Whelan, Wheatley and possibly Bruce and they are all expendible IMO.
When you consider that the best is still to come from Bate, Bennell, Blease, Buckley, Cheney, Frawley, Garland, Grimes, Jetta, Jones, Jurrah, Maric, Martin, Morton, Strauss, Watts and Wonaeamirri + Scully + Butcher - ALL highly touted players under 22 - it doesn't look so bad.
That's almost a full team right there.
I accept Sheahan's POV that not all promising young players will make it, but I think his article goes overboard considering the stage of development we are in.