How long before Summers replaces Geithner?

Tim Geithner's performance on the media stage left much to be desired. In theory, he should be judged on the quality of his ideas -- which I found mediocre -- but he truly bombed as a communicator. And this raises questions about whether President Obama should allow him to speak in public. Since he is such a gifted salesman, I think it would be better for Obama to get into the substance of the bank rescue and to be its front-man. I know it's a radical and shocking suggestion, but he may also want to consider replacing Geithner.