Trump says it's up to Mueller whether he testified. Come on Mueller!
Assume Mueller does as... well, Mueller does, protects the DoJ, admits he had some minor dispute with his good friend, Barr, over the amount of released information, but otherwise is just fine with the report and the subsequent procedure.
Mueller is an institutionalist. He'll protect Barr's reputation to safeguard the DoJ, and he'll not serve as an enabler of Article I powers. There will be no punchlines, no salty details, no occasion for a liberal victory lap, and he sure won't advocate for Trump to be hanged.
How is that going to play out? High expectations before, and then no results to phone home about?