Or to look another way:
David James - Getting too old
Joe Hart - Not experienced enough
Robert Green - Neither
Or the idea that dropping Green puts too much pressure on the untested Hart, but James has enough experience coming back from mistakes?
I would agree with James and Green. I would say (from Capello's comments) that Hart's inexperience isn't a problem. The fact that his kicks often go to the opposition or out for throw-ins is the main bar to his selection.