Probably the best thing to happen is Trump continues to fight releasing the full report. Which puts off impeachment through the next election but gives the Dems something else (among many things) to campaign on, the fact trump is hiding this report.
Best case scenario, Dems win white horse and new House control. Be nice to get a senate majority too. But ultimately not needed. If there is. Dem president with House protection, that report comes out and gets sent to the fbi. And very possibly trump gets indicted.
Realistically though at that point, sure hold him accountable. But he’s be out of office so it’s almost what’s the point. Especially give the fact there continues to be other investigations into trump and his company that could be far more damaging to him and his empire.