6 BCS bowls is currently $140 million a year, add in 20 other bowls at $2-5m a pop, and you have $60m more. So, they are already looking at well over $200m in revenue. As the expanded playoffs take shape, the other bowls lose total interest, and even if the playoffs double the interest, and you start having, say, $400m a year for them, you're looking at an extra $200 million. That in itself pays for the stipends in scholarships, but no more than that.
You're still going to have schools losing tens of millions on student fees, direct institutional support, and the building of facilities. As much revenue as they bring in, they are never going to make it into the black, because every revenue increase is met with new expenditures. This is a prime example. The extra money from football playoffs goes to athlete stipends, and the big majority of schools that are currently losing a lot of money will continue to lose a lot of money.