I think the point of the committee is to, MAYBE, put some pressure on the DOJ to actually address garbage a little higher up the chain from the mob itself. People like Trump and Giuliani (TRIAL BY COMBAT!) used their rhetoric to stir up those people up to begin with. If nothing else, it helps to try and control the messaging around the events of 1/6 as Trump and his sycophants continue to push the narrative of a stolen election and how 1/6 wasn’t an attempt to overthrow the results of a lawful election.
Will anything actually come of it? Well, I’m not about to hold my breath. If we lived in the good timeline, a bunch of these elected (and former) officials would already be charged with federal crimes…but it’s pretty damn obvious we aren’t.