Mueller won’t fold up shop and his team. They’ve been in DC so long that they think themselves bullet proof with the media’s assistance. Congressional investigations are merely background noise to them.
Anything that Mueller does that goes after Trump and his team will have everything on the conspiracy side made public in court for each case. There is nothing there on the Trump side but there is sedition and treason on the Mueller side. Mueller is not that dumb, and if he is then he deserves anything he gets.
Put yourself in Mueller's shoes. What would your move be? Personally I would be going full bore against the real conspirators who colluded with foreign agents to undermine an US election then to take out an US President.....and trying to save my behind.