He went too far. This isn't lying about a blow job. Why did we impeach Nixon? Trump's done much worse and more. All the things you think he's innocent of? The witch hunts? NOT! Imagine what a tyrant/monster he would be without the checks and balances.
Trump wants to be above the law. And when Republicans controlled either house, he was. Many Republicans don't want him to run again. He should have multiple felonies so he's not qualified to run. That's where all this is going. No jail time. No lock him up. Just not allowed to run for potus.