If the Dems win the House, which is likely, Trump has a greater chance of being Impeached. Unfortunately, it requires 2/3 vote in the Senate to convict and remove him and that wont happen unless a majority of Republicans agree.
Trump is likely going to fire the Deputy Attorney General, although it seems most Republicans dont feel thats needed. But if he can get support, he will fire Rosenstein and then order Mueller fired. Even if he's talked out of firing Mueller, Mueller cannot indict Trump. He can simply write a report and detail his findings. If he finds Trump broke the law, the Deputy can refer it to Congress for impeachment. But Mueller's report is confidential unless the Deputy decides what to do with it.
By law its up to him to release it to the public as he sees fit.
Trump's preference is likely that the DOJ protects him from Mueller and buries his report. Well, his preference is it all goes away and he might yet fire Mueller. But the risk is setting off a chain of events that snowballs into these vile Republicans coming to their senses and putting country over party and firing Mueller could lead to Trump's downfall. The less risky move is replacing Rosenstein with someone who is more loyal to Trump than to his duty who shelves the report.
It would be nice if Mueller could indict someone really high up like Kushner or Don Jr. That way, firing him is even more overt of an obstructionist act.
I saw one analysis that said Trump wont be indicted because obstruction requires intent and the fact he's so obviously, carelessly and frequently obstructed it proves he couldnt possibly know what he was doing. In other words, Trump broke the law so much he must be stupid rather than criminal.
We've never seen anything like this. Its unbelievable.