all of this will come down to what happens during the 2018 elections..if the dems get enough in congress to first impeach and then remove from office then they will do it and it won’t matter why or on what grounds... also they will have to implicate Pence at the same time otherwise what will they have gained?
It’s extremely unlikely Democrats would get near enough Senators in 2018 to impeach Trump even in the worst case scenario, though I agree that they would vote attempt to impeach him even if this Martha Stewart charge is the best Mueller’s got.