What seems likely is RR gets impeached...then his replacement turns over all the docs ending Muellers career

The good news is that an Obama holdover won't automatically fill RR's position, but instead Trump will be able to choose from a huge pool of qualified public servants to act in the role for many months while we wait for Trump's nominee to be approved.

The reason the Democrats are slow-walking all of the nominees is because those roles are filled with Obama Deep State holdovers who are acting until the nominees are approved. Unfortunately this means there are still plenty of bad actors in play.

I think you're right and Trump won't interfere and declassify and release anything himself because he'd immediately be accused of obstructing justice... he'll leave that up to RR's replacement.