Once a month or so, he'll indict some friend of a friend of a friend of Trump's to prove he's "getting close to the target".
Then, around the end of 2019, he'll file his "report"... essentially no evidence, but full of opinions... "Trump is Putin's puppet, Putin stole the election from Hillary".
In early 2020 the Dem Congress will impeach Trump based on Mueller's "conclusions" that Trump is a Russian asset or something.
Late 2020... Trump wins reelection by landslide.
Like the landslide that elected Republicans in 2018? If voter fraud is not dealt with the Republicans can forget about being elected, unless the Democrats want them elected. For a “loyal opposition”. A/k/a whipping boy.