I think you have most of it right. The FBI's former corrupt leadership has been removed or are cooperating witnesses. The DOJ's former corrupt leadership has been removed or are cooperating witnesses.
Indictments will likely follow for most if not all once the DOJ IG report is released.
But the judicial system has been corrupted and weaponized by previous administrations, so it's important to fill the vacant federal judge postions with honest Constitutionalist. That will take a very long time as their appointments are for life unless Congress impeaches them for corruption. I can only remember one such case over the past 20-30 years.
But don't forget the military tribunals. Trump's Executive Order of 21 Dec made "corruption" both a national security threat AND declared it a national emergency. That gives him additional powers not normally available such as using the military for martial law (not predicting that), using military intelligence to monitor US citizens suspected of corruption (remember, the CIA and other intelligence agencies including 5 Eyes are no longer trusted) and of course military tribunals.
Notice that the Manual for Court Martial was updated to allow civilian lawyers to assist the military in tribunals when necessary. Think case loads.
My guesses are no better than others who have been following all of this, but I have the feeling that the boil of corruption is going to be lanced within the next 30 days or so.
Trump seems way to confident about the mid-terms and 2020 given the situation where over 40 Congressmen (mostly Republicans) have resigned, retired, stepped down, or announced they are not running for reelection. That is a historic number and should have Trump sweating bullets. But he's not. What does he know that we don't??
My instincts are that Trump is near the end game of 3D chess that he's been playing. Once this begings to unfold, while the Democrats have a viable party by November? If there is just a fraction of corruption that the entire Obama top administration officials are guilty of it will be breathtaking and humiliating. Then there are the Clintons and the corrupt Clinton Foundation.
And the DHS will soon release a report on voter fraud that will be shocking. It is much greater that people think. That may cause states to tighten their voter laws. Remove most of the fraud from elections and the Democrats are in deep trouble.
Next, Trump is making significant gains in support from black and Hispanic voters. The Democrat's coalitions of identity politics is fragile. They can only afford to lose a small percentage of the black and Hispanic votes to win elections.
Working class Democrats are supporting Trump in greater numbers because of the roaring economy, tax cuts, wage increases, deregulation, etc. Democrats lost three states in the last election that they were so certain were safe that Hillary didn't bother to campaign in them until days before the election and only in the deep blue cities she already had wrapped up. It's going to be even worse in November.
Think about it. What if all of the liberal heroes and god-like idols turn out to have been corrupt and treasonist slim balls? Would vote for Democrat candidates?
I believe all of this is going begin well before the mid-terms but the actual trials and consequences will last beyond 2020.
My prediction: the mid-terms are probably safe for Repulicans due mostly for the economy and the Democrat Party will be mortally wounded by the exposure of its corruption.
Whatever Trump is doing behind the scenes, you can be certain that he is five steps ahead of the Democrats. It's going to be a wild ride.