I like how the burden now is that it's unprovable that these measures affected the election.
That's like asking for proof campaign ads helped and/or hurt a candidate.
I can see that being used as a defence when Congress refuses to impeach Trump after the full Mueller Investigation has been made public.
Remember, nothing here is impeachable yet. That Russians campaigned on behalf of Trump isn't something Trump can be impeached for. Collusion between Trump campaign and Russians, on the other hand, would be highly damning. The real money isn't in these troll-farm indictments. It's in finding connections between people like Donnie Jr, Flynn, Manafort, Sessions, "the Kush", and so on, and Russian apparatchik. (did I use that word right? I've been trying to expand my vocabulary.)
-k