You may see articles like this from Greg Jarrett at Fox News which claim Robert Mueller has so botched his probe of Russia collusion that he should be removed. Then you see others like this from the L.A. Times which reports President Trump doesn't plan to remove Mueller. If you are a normal human you could wonder how these can both be true.
I don't claim to know the answer; I will share with you my guess - plainly labeled as a hunch based on no inside info. I suspect a wounded Robert Mueller whose credibility grows shakier actually is a plus for the White House.
If anything damaging comes out of Mueller's investigation it is automatically suspect because of the real or imagined peculiarities and peccadillos of his operation. If, on the other hand, he finds not much, that's okay with Trump's people too.
Replacing him with someone squeaky clean doesn't especially serve the White House narrative, so don't expect it to happen. The more Mueller and his operation are perceived to be biased and unfair, the more irrelevant the investigation's output becomes.
Pro tip: If someone offers to appoint you as a Special Counsel, under no circumstances accept. Rather decline with thanks and breathe a sigh of relief that you've dodged an avalanche. The job tends to be a career destroyer.