If there was communication between Trump's Campaign and Russia, Pence gets hit. He was a part of the campaign.
However, if the entirity of Trump's campaign side is convicted of Treason, I can see a very strong case being made for a re-election happening. Because with this election, America will have not only had foreign interference within the Democratic Process, but also an unprecedented loss of the EC while winning the Popular Vote.
It's not just the interference, it's not just the Treason, it's not just the Popular Vote being 2+ Million for the loser, etc. All this together is a shistorm of Constitutional Crisis, and it would help America hopefully move past it.
For lack of a better way, it lets Republicans move on from Trump(Because Pence/Ryan would be viewed as illegitimate heirs by the Trumpettes) while losing virtually nothing, gives them time to try and actually develop a way to "fix" the ACA, and allows for the establishment who were against Trump(McCain,Graham,Rubio,etc) to take back some semblance of Control over the party.