Here's a site that lists the top TV markets:
The largest 100 television markets in the United States.
www.stationindex.com
Since there is no date attached to the information above there's no way of knowing its up to date accuracy but for arguments sake let's presume it is correct within a plus/minus ranking of 3 spots one way or another...
Excluding areas we clearly won't bother with, that leaves us with a remaining top 40 (TV market) group of: Philadelphia (Temple), greater San Francisco area (Stanford), Boston (U Mass; BC), Atlanta (GaTech), D.C. (Virginia), Houston (Rice), Seattle (U of Washington), Denver (U of Colorado), St. Louis (U of Missouri), Portland (U of Oregon), Pittsburgh (Pitt), Nashville (Vanderbilt) Hartford (UConn), Kansas City (Kansas)
Throwing in the Great White Whale... (*theoretical "national" TV market) Notre Dame..., along with Iowa State just because they're a geographical fit and..., that gives you 17 teams to pick 4 from...
Considering only the "most likely to be considered" that leaves us with Iowa State, Kansas, Vanderbilt, Pitt, Oregon, Missouri, Colorado, Washington, Virginia, Georgia Tech, Stanford, and Notre Dame...
Pare that list down to "most likely to accept" and you've got Washington, Colorado, Oregon, Stanford, Iowa State, and Kansas...
Top 4 markets of that group = Stanford, Washington, Colorado, and..., Oregon...
Those..., gentlemen, are our next four most probable expansion target markets...
In my opinion, Notre Dame can be crossed off the list because they're elitist a... h....s who don't realize that they haven't been a serious factor on the big time football scene for quite some time (along with the fact that they're scared to death of a taking on a full schedule of Big Ten teams)...; and they already have their own TV $$$$$$$$$ and it's unlikely they wish to share any of it...; now...., if That changes (seems like that was inferred once on here)....., then we might see them swallow their pride and consider the move because with them and the Big Ten it's ultimately all about the 💰...