Blaming the Russians; and by inference Trump, is easier and less controversial than examining the systematic corruption in our electoral system.
Therefore, exposing Russiagate as a lie or a minor irritant, will only lead to more scapegoating. The most likely scenario is that the blame Russia crowd will start blaming China, once the mob tires of their current hysteria.
Instead of exonerating the President after Russiagate peters out, the Trump haters will simply switch tactics. They will brand the Donald a Chinese agent and start investigating his ties to Beijing.