Steve is right. I won't be disappointed with whatever the FBI or Durham investigation conclude.
As for my personal opinion, I am skeptical that January 6th was a top-down coup attempt. It looks more like some groups like the Proud Boys and Oath Keepers came prepared for violence (as they often are) but there was no well organized plot.
As for Durham, I think he's a straight shooter and will get to the bottom of whether or not the FBI overreached in their 2016 investigation into Trump's campaign.
It does seem to me that at this point, and it's been more than seven months, that if there was a larger conspiracy behind this attack, some greater coordination and planning beforehand, some directed purpose behind it, that that would have been revealed by now. Charges brought, indictments made, press conferences announcing the discovery, leaks to the media. I can't believe that they're withholding information about a larger plan simply to be shown at a later date.
As you said, instead of an attempt coup this was just a mob that did what mobs often do. Undirected, uncontrolled violence. Nothing planned out beforehand except perhaps by those small radical crackpots. Doesn't excuse it - prosecute them.
As to Durham: I think it's clear that people in the FBI, high ranking ones, cut corners when investigating the Trump campaign. They were overzealous and skirted around the safeguards we've put in since the COINTELPRO revelations. Whether that warrants criminal prosecution will be revealed by the Durham investigation. There have been as far as I can tell no leaks from that. So either they've found nothing or he's running a tight ship.