After Yuvraj was CLEARED by Proctor on the basis that he was SHOCKED by the decision, not showing dissent (which I believe was incorrect by Proctor), there is no basis upon which Ponting or anyone else could be cited for a hearing. End of story.
On the umpiring front - Kumble agreed with Ponting that if there was a dispute, the fielder and the captain's word was final. THE PURPOSE OF THIS AGREEMENT WAS TO AVOID ENDLESS REFERRALS TO THE THIRD UMPIRE. Ponting is the one who has been pushing this for 2 years now.
Ponting went to Clarke, Clarke stated that he believed he caught it, and Benson, knowing that this agreement was in place, asked the fielding team's captain for confirmation, which Ponting gave. If you've played cricket at any decent level, you will know that if there is doubt like that on a catch and the umpire asks for the fielding captain's final word, the universal signal from the captain is to put the finger up to indicate "out".
Again, separate the emotion from the facts and then analyse. Or reverse the facts - if Jaffer had dived forward at gully, Kumble would have been the man putting his finger up and Benson would have been the one following.
