I think the restructuring is going to take a while yet, but moves like this probably do signal the end of the beginning.
I haven’t looked yet, but I wonder if it would be possible to find news stories and opinion pieces for other watershed moments, like when the Ivies formally dropped athletic scholarships or when the D1-A/D1-AA split happened. There was a great Texas Monthly article from the 70s where UT was already moaning about the rest of the SWC, and while it focused on gameday revenue, it looks prescient in hindsight.
It’ll be interesting to see if the B12 and ACC give lip service to working together.