My feeling is the bold would be the goal in a sense. Add FSU, Clemson, NC, and another and the SEC is basically Tier 1 CFB. The NIL money and brand prestige would be enormous and most major recruits would flock there. Every other conference would be tier 2 CFB over time. To prevent this the B1G would either need merge with the PAC or raid the PAC and ACC to form another Tier 1 Super Conference.
Think of it like the proposed European Super League (soccer) where the most valuable brands got together and determined they didn't want to share any of the revenue or recruiting advantages with smaller clubs. It didn't succeed because the founders didn't understand the public well enough. The American public could equally hate the idea of CFB being basically the top 40-50 largest brands as well. If not, I could see a scenario where CFB is two mega conferences and anyone not in them are similar to FBS schools today.