As to the second question, I'd have to say the opposite of your statement about "deep down...." I'd say deep down I'm very optimistic that the Dems will nominate the right person to prevent a 2nd term. None of us can really know and there are so many things that can happen between now and then. It's going to be an interesting ride.
Impeachment is tricky. On the one hand it is the duty of Congress to bring impeachment and it could be dangerous in the future if they do not. I'm not in favor of it though, because the result will not benefit anyone. The focus needs to be on winning the election.
The best way to be rid of Trump is to vote him out, by a landslide.
I think you are very intelligent as well and I respect the manner in which you communicate your opinions, whether I agree with them or not.