While I would quibble over the word "raid", I agree that the ACC is next major conference to change, but most likely that change is 10 years off or more - closer to the expiration of the GOR.
It's just that I think the ACC move will be initiated by schools within the ACC, not the SEC itself, just as Texas appears to have engineered Texas' move with Oklahoma to the SEC. In other words, I don't think there will be a 2008-style announcement from the B1G (or SEC) saying, "we're open to expansion", which netted the B1G NU.
I think the schools that move out of the ACC will be torn between the B1G and the SEC. So, I'm not sure if UNC and UVA wind up in the B1G or the SEC. Do they want a "northern feel" or a "southern feel"?
While the B1G certainly has a "superior" overall academic composition, the SEC has a solid academic foundation, too: Vanderbilt, Florida, Texas, Texas A&M, Missouri, Georgia, others. Thus, money, NIL, and recruiting in the SEC may be more important to UNC and UVA than money and a deeper academic composition presented by the B1G.