I would be shocked if the House impeached him. The Senate maybe, but this is going to be dragged out likely for years. The GOP has too much to gain with him in the White House rubber stamping their agenda, and too much to lose in conceding that he's unfit to serve as president or has violated the law. They got the Scalia supreme court seat back through obstruction and are somewhere in the process of rolling back parts of Obamacare. There's absolutely no reason for them to turn on Trump now.
It also doesn't seem likely the Dems will sweep the midterm elections next year. Likely some gains in the House, but not the 24 needed to take over majority. And there simply aren't enough GOP Senate seats up for re-election in 2018 (there are several Dems up though). So again you're looking at gridlock with no foreseeable path to impeaching him in both houses of Congress.
With the FBI investigation slowed down for the moment, and the House committee at a stand still because of interference from Nunes and such, the Senate committee is the best hope. And best case scenario is that eventually enough small items trickle out from testimony that maybe somebody (Flynn, Page, Manafort) gets desperate and turns on the administration. But my guess is none of the underlings have direct evidence of Trump colluding with Russia.