For the Conservatives to come up with a humane moderate for a leader they would have to have a majority of sane moderate humanitarians in their party.
Problem is, most of the sane moderate humanitarians in the Conservative Party have left, and most of them are not supporting the Liberals.
The Conservatives are going to select a Harper toadie, or a Charismatic crazy. The reason, because that is all that is left of their party, the Harper toadies and the crazies.