I don't know though. Do you believe Trump is a willing partner, or is he just a tool? Okay, yes, we know he's a
tool, I mean is he a tool that Russia is using, without actually being an active participant.
Consider a scenario: Let's say that Russia wants to destabilize the US. They believe that one of the most powerful ways to do that is to weaken the trust of US citizens in the efficacy of the federal government. They wish to sow discord, increase schisms between parties, and focus the government on never ending distractions.
Given two candidates, Clinton and Trump, which of those is most likely to create the maximum amount of discord? I think you'd have to argue that Trump wins that one. Even if Clinton was pretty strongly disliked by a large portion of the voters (which she was), that doesn't mean that she'd be ineffective. Not being well liked doesn't mean she's all that interesting.
So... let's apply some game-theory-ishness. Let's assume that Russia has already hacked several various servers, and has all sorts of information. Let's construct some scenarios and consider our options.
Scenario 1: Russia supports Clinton. In this case, Russia would make efforts to keep all of Clinton's emails, as well as the DNC emails, under wraps. They'd release any information they have that disparages Trump. They would attempt to influence the outcome of the election so that Clinton wins.
In this case, disruption is minimal. A pretty solid portion of citizens already support Clinton. She has a background in politics and know how to play the game. The release of unfavorable information about Trump doesn't really come as a surprise to anyone. This isn't going to destabilize US democracy.
Scenario 2: Russia supports Trump and engages Trump and his administration to act on their behalf. They release anything they have that casts Clinton in a poor light, and withhold any information about Trump. They have planned and purposeful meetings with Trump associates to make plans. They influence the population so that Trump wins.
This is going to cause a fair bit of disruption. Clinton's lead makes Trump's win seem unrealistic. The release of information about Clinton seems biased and raises questions, especially when everyone is already pretty damned sure that Trump has some massive skeletons in his closet. Clinton's lead in the popular vote casts doubt on the electoral process as a whole. This might destabilize US democracy... but it comes with a big risk: Trump. Russia is not dependent on Trump keeping his mouth shut about the whole things and continuing to play their game. He might change his mind, and then things are going to get ugly for Russia. Additionally, having Russian operatives meet with Trump associates is likely to be uncovered by the intelligence community, and prompt investigations that Trump and his associates will seek to impede.
Scenario 3: Russia supports Trump and does not engage Trump or his administration to act on their behalf. They release anything they have that casts Clinton in a poor light, and release select information about Trump that casts him as untrustworthy (the pee tapes). They arrange for Russian operatives to meet with Trump associates who are not aware that they are Russian operatives. Trump and his associates believe that they have done nothing wrong. They influence the population so that Trump wins.
In this case, the disruption is pretty big. You get all of the same outcomes as in Scenario 2... but you get the additional benefit of Trump vehemently denying the entire thing. Trump will fight to the death on this, because he's pretty much being gaslighted. Add to that, the release of at least some unfavorable information about Trump makes him a bit paranoid. There's enough intelligence to support allegations of collusion, but not enough to prove it... so there's unceasing media attention on the whole thing. Pl;us, as an added bonus, Trump develops a persecution complex and steadily goes more and more insane, plunging the entire country into chaos!

As far as conspiracy theories go, I think this one is a win!

Also, hyperbole aside, I think it's plausible, which makes me sad.