It seems fairly clear that Yahoo needs to not mishandle Tumblr in this way, and that Mayer is totally aware that this is a large factor on which she will be jud

It seems fairly clear that Yahoo needs to not mishandle Tumblr in this way, and that Mayer is totally aware that this is a large factor on which she will be judged. Maybe it's naive to think that a new CEO can cut through cultural and corporate cruft well enough to make this happen, but I think Mayer commands respect in a manner radically different to all but a few CEOs - especially among developers.