How many eyeballs would ISU add? Can you honestly say it'd be more than bringing in a team from a different state? There are a lot more people that watch both teams than you think, I'm guessing. The majority of both fanbases do not belong to a group that calls themselves "fanatics".
Just so we have some objective data on this...
http://thequad.blogs.nytimes.com/20...-college-football-fans-and-realignment-chaos/
...from our friends (now at) the 538 website.
I have heard that point before. Something like...
"ISU has a small, but fanatically devoted ACTUAL fan base to its school and teams."
+ strong academic school, some reasonable tradition in some other sports than football, etc.
"It's downside? Can't even really deliver its own media market, Ames/Des Moines, which is somewhere in the 70s in terms of national ranking."
In an era where geographic proximity to large media markets is the only thing that matter, we're screwed. Things change a little bit if having an active fan base matters more.
According to that resource,
Maryland = 475,000 followers
Rutgers = 930,000 followers
Iowa State = 535,00 followers
We're actually a better choice than Maryland on those metrics. We just don't deliver the Washington, DC and Philadelphia media markets. Take that away, and we look more attractive.
We'd be ahead of...
Northwestern
Vanderbilt
Maryland
NC State
Wake Forest
K St.
Baylor
Colorado
Arizona
Oregon St.
Utah
Stanford
Washington St. (damn, lots of P-12 schools)
USF
Cincinnati
Louisville (yes, them)
...on the rankings. Pretty far from somebody to get dropped, I hope?
Then again, there would be so many changes to the system if the cable TV money dried up I can't think about this holistically right now to the point that I can say this is somehow a universal good for us. Unless there's a "$1 to 1 fan" ratio out there in the end, whatever the delivery method (a la carte pricing through the schools or conferences, live attendance, donations, etc.) for funds, who knows what could happen. But it's nice to rank above teams without huge followings but with better media markets than Central Iowa (Chicago, Nashville, DC, Raleigh, Denver, Tucson, Portland, SLC, the Bay Area, Spokane, Tampa, Cincinnati, Louisville) above.
Let's say that your 4 conference scenario comes true and that no teams from those conferences move. Only teams from Big 12 and outside P5 are available.
Big 10 has only gone after AAU schools (even though Nebraska lost theirs). D1-A teams that are currently AAU and not part of one of the other P5 conferences:
Texas
Kansas
Iowa State
Tulane
Rice
Buffalo
Texas would be a big get for the Big Ten, but they would be more likely to join Tech, OU and OSU and go to the Pac 12 than to go to the Big 10. There would be a lot of pressure in the Texas legislature for them to do that.
Kansas also has issue with K-State, but I don't think they are as closely tied as Texas/TT and OU/OSU are.
Tulane, Rice and Buffalo have nowhere near the fanbase that ISU has.
There is also Notre Dame out there, but I believe that ship has sailed and if they do join a conference as a full member, they will stay with ACC.
The question is would Big Ten go outside of AAU. Here are the non-AAU options from Big 12:
OU/OSU - tied together and Big 10 is unlikely to take OSU because of academics
TT - tied with Texas and unlikely to take because of academics
TCU - Fewer fans than ISU
Baylor - Fewer fans than ISU
K-State - Fewer Fans than ISU and unlikely to take because of academics
WVU - Does bring a lot of fans, but is unlikely due to academics
Here are the top non-AAU options outside of P5 that have higher fan ranking that ISU:
UConn - Not a strong football program, slightly more fans than ISU
BYU - Not sure if Big 10 would expand out west
So there is your answer. I am sure you will come up with some stupid response to refute it that is biased with black and gold and has no facts to back it up.