There are 2 factors to consider:
1. Do they determine that Trump is posing too much danger to the country to contain
2. Does public opinion change enough that they don't think Trump could carry them in the upcoming election
We may already be there prompting using the recess to lay low and see how the investigation plays out. But I have little confidence in that. My hope is enough of that sentiment at least holds off the politicians and pundits from riling up the base. I have a suspicion that supporters who aren't getting the echo effect from Fox news, etc., at least to the same degree, will start to see Trump as whining instead of winning.
Otherwise, the critical point would be the impeachment trial in the Senate. Firstly, can they come to an agreement in rules that limits the unscrupulous whataboutism, obstruction, non-answers, etc. that have plagued attempts to expose Trump during open hearings. Secondly, is the public interest going to be like it was with Nixon, or are we just going to consume sound bytes and particularly the kind of Fox spin jobs which have isolated Trump from action to this point?
One idea for impeachment rules might be a blind vote. That would be the best shot for the party if they want to can Trump and not risk alienating the base. They could even collaborate to make the vote seem super close.