It really doesn't matter that much.
They only need a majority of the House to start impeachment, but they need 2/3 of the Senate to convict.
2/3 of the Senate is completely out of reach for both parties.
I can easily envision a "permanent impeachment trial" which would turn out to be a very public forum for DJT to promote his policies to the entire country. This would reflect poorly on the Dems.
The Dems will call him to the floor of the Senate and ask him about some made up charge, and he will answer by stating how many miles of wall he has completed. They will ask something else and he will expound on the benefits of fracking. No matter how many times they do this he will be able to answer by making statements that put him in the best light.
The Rs will never vote to impeach.
Well Romney would vote to impeach just because he’s a prick..if Trump wins but the Dems take both House and Senate(I think GOP keeps the Senate but doesn’t regain the house, I hope they do but I doubt it too many to flip) the Dems will go to impeach Trump for the corona virus, charge him with 250,000 counts of murder or something I can see them doing that