I don’t think they were ever serious about conspiracy.
I think it was an obstruction trap all the way. Set up a bogus investigation and hope that Trump ‘obstructs it’. It’s actually easy to see why they’d try it because Trump was even making me nervous some of the time.
But I think he saw what they were up to and went out of his way to provide documents, interviews and etc. So much so, that Mullet/Weismann had no grounds to to demand and interview with Trump, himself.
Weismann got outplayed and punts to Democrats in Congress. End of story. Weeks later it was on to Ukraine.
See my sig. They will never stop.