End Game?

I have been following (or partly following) this week's emerging and expanding news accounts of the "involvement" of the Russians in our last election.  But today I find myself asking, "What is the end game of these investigations and hearings?"  If the actions of Mr. Trump and/or his associates was prosecutably criminal, then that may lead down the path of impeachment.  Even if it is demonstrated that Mr. Trump succeeded in the 2016 election "because of" Russian involvement, I cannot envision a situation where the election results would be nullified and the office given to Mrs. Clinton.  

But what if the sum of these actions does not rise to the level of criminality?  What if the actions of Mr. Trump's surrogates and associates was merely (merely?) reprehensible and morally outrageous?  At that point (full disclosure=I believe that we have already crossed that line), I think that the Republican leadership needs to disavow Mr. Trump and cut him adrift.  That may be a difficult political choice, but I know that I am watching to see what happens over the next few weeks.  If the Republican leadership continues to allow Mr. Trump to hijack the Party, then I, for one, will be looking for a new political home.