Russiagate was about things far more significant than any potential future role in impeachment.
1. Preventing a diplomatic reset with Russia. Deep State, Israel and other interests have too much invested in the current demonization of Russia to allow it to be set aside.
2. House training Trump. The message was clear, play ball on foreign policy or we can do a Nixon on you and your team. Looks like he got the message.
3. Diversion away the real reasons that the DNC/Clinton campaign lost.

US electoral politics is as fake as a WWF match, the same promoters own and manage both teams. And Trump is the perfect foil for it. Now, "Lets get ready to RRRRRRumble!!!"