I have no idea if conferences are going to try to get to 16, but if they all do here is what I would like to see. The Big 12 would definitely be the worst conference overall in this scenario and I only added Oklahoma State to us because then it helps us get Oklahoma in my opinion.
Big 10: Illinois, Indiana, Iowa, Michigan, Michigan State, Minnesota, Nebraska, Northwestern, Ohio State, Penn State, Purdue, Wisconsin, Oklahoma, Oklahoma State, Notre Dame and Kansas. Bold teams would be in the West division and you could pod from there.
SEC: Alabama, Arkansas, Auburn, Florida, Georgia, Kentucky, LSU, Ole Miss, Mississippi State, Tennessee, Vanderbilt, South Carolina, Missouri, Texas A&M, UCF and South Florida. The last two were added because they would need to be two teams that joined a power 5 conference possibly and they are located in a good area to join the SEC. Bold teams would be West division.
ACC: Boston College, Clemson, Duke, Florida State, Miami, NC State, North Carolina, Pitt, Syracuse, Virginia, Virginia Tech, Wake Forest, Louisville, Georgia Tech, Maryland and Rutgers. Maryland and Rutgers would work for the ACC and might fit ok. Bold teams would be one division.
Pac 12: Arizona, Arizona State, California, Oregon, Oregon State, Stanford, UCLA, USC, Utah, Washington, Washington State, Colorado, Boise State, San Diego State, Fresno State and Nevada. The last 4 would have to be added and I think they would be the best fit for where they are. Bold teams would be North division.
Big 12: Baylor, Iowa State, Kansas State, TCU, Texas Tech, Texas, West Virginia, Houston, Colorado State, Northern Illinois, Cincinnati, Memphis, App. State, SMU, BYU and Temple. This was the toughest conference to figure out and add teams to. I could see a North and South division here with the teams in bold being the North.
This is obviously just my opinion and I was messing around with the teams quite a bit. The teams that I added could obviously be switched out for other teams.