What evidence do you have for this? The democrats are showing nothing that suggests they will take either chamber of congress. Even if they got control of the house and actually impeached, the results would be no different than the previous 2 impeachments where the senate took no action. Even if they get control of both chambers, they'd have to have an over whelming victory to reach enough seats to secure a conviction since it needs a 2/3 vote.

The current administration is behaving exactly like they know this. They are also boosted by the fact that SCOTUS told essentially told POTUS that he can do whatevs without repercussions. He's even ignoring their direct orders, and still nothing.

You can call me pessimistic, but these are just the facts of the situation. You're optimism is based on what?