The whole reasoning behind the current scheme is to put power back in the hands of the conferences. They were losing credibility with the BCS and other version of the mythical national championships leaving out quality, deserving teams almost on a yearly basis.
So they concocted a playoff scheme that let in only a very few teams, which meant it would emphasize 1) the existing power conferences and 2) the need for conference playoffs, which generates more money and power for the conferences themselves.
They knew they could use the relationship with media (BSPN) to focus on the SEC, or whomever the most powerful conference is at the time, to drive the discussion towards conference allegiances. What they want is fewer, bigger conferences where they can control the revenues and direct the outcomes between an oligopoly of powerful men.
The committee format allows them get rid of independent detractors who had successfully brought the BCS to its knees. Where a few people have the power to pick the tournament participants, regardless of what individual teams do on the field, speaks to the corruption of the system. The conferences now have ALL of the power in college football whereas before they had to worry about the random upstart or the big elephant in the room, Notre Dame.
They know they can force ND into a conference given the current system, or ND will eventually lose their significance. Even with their large following, ND needs to be in the national championship conversation to perpetuate the mystery and intrigue of the current football program.
They are not in a rush to expand the playoff to 8 teams. They want to force all conferences to have championship games first (more revenues), and then consolidate into several power conferences where they have ultimate control of the system.
I believe that was their blueprint all along.