This is only partially true. The original expansion by the B1G was for TV markets (Maryland DC / northern VA), Rutgers (NY / NYC). GT was reportedly the other option. That’s not the driving force anymore.
The B1G like the SEC wants football brands. Clemson, FSU, Miami are the top 3 ACC football “brands” (even though Miami isn’t Miami pre-ACC) they are all national brands that drive TV numbers nationally. The most obvious fit for the B1G would eventually be ND. After those 4 you have the group of GT, UNC, UVA, Duke, NCSU. Still seems like the SEC would go for some combination of FSU, Clemson, UNC, NCSU, VT, UVA. If UVA doesn’t show some life in the next 2-3 years, they are out. VT would be the next obvious choice.
Look at the last 4 brought in by the B1G, they are all national brands (USC, Oregon, UW, UCLA) with recent football success. UCLA no longer has the financial excuse.