I think what's particularly interesting to consider is how long Harry will live, and how much will we see of his whole existence. Wizards live several hundred years, and give this story goes into the End of Days and is titled "The Dresden Files" one might assume we see his whole story. Jim has openly said in previous interviews that he isn't sure if Harry will survive the series.
Dresden may indeed die at the end of the BAT; it seems entirely possible, maybe even probable. But I'll note that the series is also called "The
Casefiles of Harry Dresden," so if he moves fully into the "Wizard of Chicago" gig, that'd be the end of the whole PI-oriented casefiles" schtick.
... Harry may well form another White Council after the inevitable collapse of the current one. But if the White Council collapses around the various apocalypses, is there even much point?
My notion (I think it's one others share) is that Harry leverages the Paranet to build a broader coalition, one not exclusive to "White Council Caliber" talents. The foundation IMHO would be educational: "how not to fall afoul of Black Magic ways." This, above all -- the lack of WC guidance for the proto-wizards who fall (all too easily) into the lures of power -- is the thing where Harry feels most-keenly that the WC is just not doing a good-enough job. And the Paranet is well-suited (in terms of "feet on the ground" & connections into communities) to spot these cases and intervene before things get to the "call for the Grey Cloaks" stage.
It doesn't even have to wait for the WC to collapse -- it could start right away, using the Paranet to begin educating Paranet-level talents. And if they occasionally don't report every single "Wizard Caliber" talent up the tree to the White Council... Well. That just adds more complication to Harry's life (which after all is Jim's bread&butter (and mortgage)).
... Not only that, I think it should be noted that Harry fundamentally rejects authority. While he has matured and become less abrasive, he ultimately still dislikes the idea of any governing body being in charge of him or anyone else. He's quite the libertarian. So, in the event the White Council does dissolve, I don't know that Harry would be the one to rebuild it. That's more of a Carlos type-of-thing ...
As others have said, it's not really anti-authority. It's anti-bullying, and anti abuse-of-power.
But earned expertise and good judgement --
being an authority, not just having a
position of authority -- is something Harry respects, and often yields to.