I do not see Mueller being a stupid person as he survived in DC for so long in such high positions. I do not see Mueller closing up shop without trying to save his skin and being very, very useful, especially since his skin also needs saving being part of some of the mess...but then again I have never seen anything like what has been going on in DC. The fact that all the committees are fighting the left with their memos tells me something is actually in the works to be done about the last administrations abuse of power. We are in the midst of an education of the American public to prepare them for what they already have planned.
I guess it all depends on how much of a leftist ideologue Mueller is. He could conceivably double down and politically die on the Trump obstruction hill. I would hope he sees the jeopardy he is in and opts for the potential scenario you lay out.
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.