Mueller hasn't done anything but prosecute Trump associates, which he will continue to do, as he works his way towards the top. Rosenstein has stated he fully supports this, several times now.
It is the conservative media and the Congressional committees that have exposed Mueller's biases, but only Trump (or AWOL Sessions) that will ever shut him down for them.
It is the conservative media and the Congressional committees that have exposed Mueller’s biases, but only Trump (or AWOL Sessions) that will ever shut him down for them.
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At this time it would be stupid of Trump to fire him and Trump isn’t stupid.
The longer Mueller operates, the more discredited he becomes and he won’t ever effectively reach “the top” as you put it.