Unfortunately, there were and are a lot of people that weren’t goofy people entertaining themselves. They took it seriously. That’s why they’re dangerous - not specifically because they believe QAnon crap, but because they will believe anything despite the evidence to the contrary.
It could even be said that people believing that they should “Trust Sessions” is why Trump has had most of his first term hamstrung by impeachment and other crap - because instead of calling for Sessions’ head on a platter, people were “trusting Sessions.”
I doubt that Trump was affected at all by those opinions. He chose Sessions and once he was confirmed Trump was stuck with him.