I am of the opinion that the President should NOT fire Mueller but rather appoint additional special prosecutors.
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Why should Trump surrender on the firing issue? He would be well within his rights to fire him. And, if he waits, say, another 6 months and plans it out, he will most certainly prevail politically.
Just because one does not execute an option (firing) does not mean that the option is removed. However, by adding special prosecutors to put pressure on the establishment and the dems by following the non-collusion data dug up, it puts pressure on anyone associated with Clinton and the DNC.
After the dems start getting forced to deal with depositions and subpoenas and other legal actions, they themselves will start calling for shutting down the office of the special prosecutor. It puts the dems in the position of either shutting it down, or start sending their cronies to jail.