You're confusing him getting indicted with the administration and Congress respecting and following the indictment. If Mueller finds sufficient evidence of wrongdoing on Trump's part, he will obtain an indictment against him. That is not the "hard" part. After such an indictment is issued it would be up to law enforcement, the White House, Congress, and the Courts to follow through on it. I list Congress as they can make the situation easy by immediately impeaching Trump after being presented with said indictment, but assuming they don't, and assuming the Administration doesn't hand over Trump, then it would go to the Courts which would decide whether a sitting President can be indicted for crimes that likely occurred before taking office.
I don't believe I'm confusing anything, and that's a blind assumption on your part about Mueller. He's always been very pragmatic: even if he finds evidence of criminal wrongdoing, there is no guarantee he will indict. He knows full well what a can of worms that would unleash and it's quite possible that he would elect, instead, to just make his recommendations to Congress and let them take it from there.
But- since we're now dissecting everything to the nth degree, let me clarify what I'm getting at:
- Mueller may or may not attempt to obtain an indictment against Trump - but the end result is pretty clear: it's not going to stick, so what does it matter? The SCOTUS will slap that shit down like flies on a rib roast.
- Dems in the House (assuming they take it back for 2019) may or may not attempt to impeach Trump- but they will do so knowing they have no chance to get the Senate to remove him. It would be a purely political play meant to damage him and the GOP as much as possible prior to 2020.
Anyone waiting to see Trump go to jail or be removed by impeachment is setting their self up for disappointment. IMO- it's extremely lame and tantamount to shitposting to come into a thread like this and remind everyone that "nothing will happen" because it isn't going to immediately land him in jail or put him on the unemployment line. These things are all adding up. They're isolating his base from independents. They're tarnishing his brand and, by extension, the GOP. The Dems are going to have to massively fuck things up over the next couple of years to not be back in charge of both the executive and legislative branches.