Here is what I think may happen, and considering the situation, I think it is fair.
These are just example numbers thrown out there, Not anything remotely correct or even educated guessing.
But I think what could happen is each conference that is in the playoff will get a set lump sum. Then they will get a bonus for each team that gets in. Possibly a bonus for each game they get, ie the champion will get more because they played more games.
example:
Each participating conference gets $10M.
Each participating team get bonus of $3M.
Each participant in a game, gets bonus of $1M.
Conference would be free to decide how this is distributed. Ie, to all in conference or bonuses to participants etc.
So obviously if this happens the SEC and B1G will usually if not always get more, but it makes it at least fair to a point that anyone can get those bonuses.
Im sure the B12 and ACC want it distributed equally but I dont think that happens and this may be at least a compromise.