That's a good theory. But the reality is that if every team in the Big Ten (and probably other BCS conferences in the future) needs to buy 2 home games every season then the demand increases for those games and the price will also increase.
The way it is now, Minnesota schedules 2-for-1's with a lot of non-conference opponents (Bowling Green, Miami-OH, Florida Atlantic, Troy). But if all your OOC road games have to be against a BCS opponent, you no longer have that return trip to offer in exchange for 2 home games. And everyone else can no longer offer a return trip in exchange for 2 at the same time.
The result will be that only the teams in BCS conferences that can offer a huge guarantee (big stadiums) will be able to keep the 7 home/5 away schedule. Others will be priced-out of the market for buy-in games and will need to go with a 6 home/ 6 away schedule or eliminate OOC games against BCS opponents and play only 2-for1's.
If you are doing 2 for 1's against some teams do it like this.
4 home conf 5 road conf 1 home BCS non conf 2 home non-BCS non conf
5 home conf 4 road conf 1 road BCS non conf 2 home non BCS non conf
4 home conf 5 road conf 1 road non BCS non conf 2 home non BCS non conf
Then start a new home/home against a BCS opponent. The difference would be you would only get the non-conf vs a BCS 2 out of 3 years....and you would have less variety out of the other non conference teams (likely playing a non-BCS school 3 years in a row). Buying games vs. FCS schools will continue to be easy and cheap as long as that level keeps expanding. One game vs and FBS team can pay for a school like USD's entire year. It is doable. Many schools are not scheduling BCS opponents anyways.
Many of the Pac Ten schools play multiple quality non-conference opponents but have resorted to going 6-6 one year and 7-5 in the other year. Even with 5 conference road games in some year, there will never be a time where in order to schedule a quality non-conference opponent you are forced to go 6-6 every year.
Lets set up a 13 year cycle for the gophers
4 conf Road, 5 conf home, 1 BCS road, 1 MAC Home, 1 FBS Home (7 home games) (10 BCS Level teams)
5 Conf Road, 4 Conf Home, 1 BCS home, 1 MAC home, 1 FBS Home (7 home games) (10)
4 Conf Road, 5 Conf Home, 1 MAC Road, 1 MAC2 Home, 1 FBS Home (7) (9)
5 Conf Road, 4 Conf Home, 1 BCS2 Home, 1 MAC2 Home, 1 FBS Home (7) (10)
4 Conf Road, 5 Conf Home, 1 MAC2 Road, 1 MAC3 Home, 1 FBS Home (7) (9)
5 Conf Road, 4 Conf Home, 1 BCS3 Home, 1 MAC3 Home, 1 FBS Home (7) (10)
4 Conf Road, 5 Conf Home, 1 BCS2 Road, 1 MAC3 Road, 1 FBS Home (6) (10)
5 Conf Road, 4 Conf Home, 1 BCS3 Road, 1 MAC4 Home, 1 FBS Home (6) (10)
4 Conf Road, 5 Conf Home, 1 BCS4 Home, 1 MAC4 Road, 1 FBS Home (7) (10)
5 Conf Road, 4 Conf Home, 1 BCS5 Home, 1 MAC4 home, 1 FBS Home (7) (10)
4 Conf Road, 5 Conf Home, 1 BCS 4 Road, 1 MAC5 Home, 1 FBS Home (7) (10)
5 Conf Road, 4 Conf Home, 1 BCS 5 Road, 1 MAC 5 Home, 1 FBS Home (6) (10)
4 Conf Road, 5 Conf Home, 1 MAC 5 Road, 1 MAC 6 Home, 1 FBS Home (7) (9)
So in those 13 years, the gophers would have played 7 home games 10 times.
In those 13 years, the gophers would have played a BCS level non-conference opponent 10 times.
The gophers would have lost 3 home games.
In an 8 game conference schedule, the gophers would have played 9 BCS level opponents per year or 117 in 13 years. In the 9 game schedule, the gophers would play 127 BCS level opponents in 13 years.
In an 8 game conference schedule, the gophers would host 58 or 59 home games against BCS level opponents in 13 years. In a 9 game conference schedule, they would host 63 or 64 games against BCS level opponents. So it is just a matter if the revenue lost from those 3 missing home games is more than the increase in revenue that 10 extra games (5 at home) against higher level opponents would bring. If you have three seasons in the 13 where you play 2 FBS instead of 1 FBS and 1 MAC, then you could get it down to playing BCS level non-conf opponents 10/13 years and playing 7 home games in all 12 years. Granted, you could only count 1 of the 2 wins towards bowl eligibility. Bringing in more conference games would also up the value of the next TV deal, making the lost 3 games seem less painful to the budget.
BCS1 = 1/1
BCS 2 = 1/1
BCS 3 = 1/1
BCS 4 = 1/1
BCS 5 = 1/1
MAC 1 = 2/1
MAC 2 = 2/1
MAC 3 = 2/1
MAC 4 = 2/1
MAC 5 = 2/1
MAC 6 = 1/-