Here is my speculation. Hopefully I do not sound like a downer… And, I agree that I have been wrong before. Far too many times.

My suspicion is that Putin and his friends have been using Trump for money laundering.(Into, and out of, real estate) For well into the 9 figures. And that Trump had little cash beyond that for most of the 21st Century. His whole family is vulnerable there. Including to the NY State AG.

I also suspect that Trump will eventually successfully fire Rosenstein and Mueller at some point. But that it will not matter if the Dems can do well enough in the 2018 mid-terms.

Remember that Nixon was able to fire the first special prosecutor. And it still did not end well for him.

The other thing that can happen is that a crisis, domestic, economic or foreign can affect the elections as well. In the short term there is likely to be a rally around the flag boost. However, it will fade in time and become another negative. The Bush-Iraq wars fit this mold.