The path ahead is narrow and treacherous
One "good" scenario (Less devastating to our nation than others) is Trump continues to tarnish the republican brand to the point democrats take the senate and maybe the house in 2018- Impeachment happens just before or after the midterms.
Then Pence is lame duck- unable to advance his agenda, and the virulent Trump base fracture what remains of the GOP...
As disastrous as all that would be for our nation, it is the least catastrophic...
You REALLY don't want to know the worst case scenarios...