I'm afraid this could backfire democrats in the 2020 elections.
Absolutely agree. A lot of Donald Trump's power is based on him positioning himself as the 'anti-establishment' candidate, standing up for the regular man-in-the-street against the mighty powers that control the economy. Regardless of what Trump's real position and motivation is, the risk remains that the impeachment process simply entrenches Trump's existing support, and even draws in new voters to his 'anti-establishment' cause.
The question of whether a billionaire who literally has a tower of gold can be 'anti-establishment' is beside the point...