Now that the whole Mueller thing isn't panning out Dem's cranking up the impeachment by other means talk. I expect them to vote on Articles of Impeachment at the start of the 2020 election campaign. The Democrats will get them approved along partisan lines inside the house where a simple majority works, and then they'll get shot down at the Senate level where it takes a 2/3rds majority.
The result will be them turning the 2020 election into an impeachment campaign and that will get President Trump elected again. They will also likely lose some seats due to the more moderate states not liking the whole "Impeach at any cost" thing.