If you asked me I'd say Trump resigning from office is far more likely than his impeachment because the simple truth is Republicans control Congress. Impeachment would have to be approved by Speaker Paul Ryan, a man who will never stop making excuses for Trump.
Referring to FBI Director James Comey's testimony, Ryan said Trump is just "new to this."
“I would just say that of course there needs to be a degree of independence between [the Department of Justice], FBI and the White House and a line of communications established. The president’s new at this. He’s new to government, and so he probably wasn’t steeped in the long-running protocols that establish the relationships between DOJ, FBI and White Houses. He’s just new to this.”
This is where Republicans are at now. Their best defense of their leader includes publicly stating that he has no idea what he's doing. He's just a big dumbass, they say. He knows not what he does.
As you know, ignorance is not an acceptable defense for committing a crime.