Except that the questions weren't neutral - Rogan publically expressed disagreement with Yamasaki while watching the replay, and then went on to say to Silva that he considered him the winner. I thought it undermined yamasaki's authority and looked very bad. Also - what if it had turned out to be an obviously incorrect call? How would that have looked for the UFC then? No referee could change his decision while being interviewed under those circumstances and retain any credibility at all, but being forced to defend the decision made would only make things worse.
It's all a matter of opinion though, I guess.