Ten years ago I thought TX & OK would ultimately be in SEC. The other things - no.10 years ago I think you would be correct, but things are not the same as 10 years ago. Pac12 originated as Pacific coast conference in 1915, older than the SEC by 17 years, an original P5 school. Today, it's entering its final season because it's members have been taken in by 2 other conferences. SEC brought in 2 teams, Big10 not only matched but brought in a couple more. Big12 grabbed multiple Pac12 teams and some non P5 teams.
I don't know what's going to happen, but as little as 10 years ago, I didn't think the Pac12 would cease to exist, Texas and OU would be in the SEC or SoCal, UCLA, Wash and Oregon would be in BIG10. I just think if we intend to remain the top conference, we need to keep our biggest competitor out of our house. Big 10 having multiple teams in the SEC footprint will hurt the SEC teams not in those states, Carolina, UK, Missouri, and Mississippi schools the most because they will be taking player willing to leave their state.
Going after some ACC schools doesn't make sense to me if they really want to be a part of the B1G. They each know better what they want than the SEC does imo.