Yeeeeeee---eaaaaaaaah, I don't think the Dems will give up their impeachment obsession until Trump leaves the WH, which is looking likely to be in January of 2025.
My thinking, which could be wrong, is that Trump will win again in 2020, the Dems will lose the House, and the Rs might gain a few seats in the Senate. So that would castrate Dems' push for impeachment, but probably fuel their TDS "seven times hotter".