So this is nothing close to real, but it's one of my ideas for a new NCAA playoff and realignment. The league is split up into Power 8, Group of 8, and Notre Dame/BYU, who are independents. Each conference has 8 teams split into 2 divisions. Each team will play 10 conference games (2 against each division opponent, 1 against each cross-division opponent), and 2 non-conference games. Then the top two teams in each division will compete for the conference championship, and the winner will go to the playoffs, which consists of twelve teams (8 conference championship winners, 1 G8 team, and 3 at-large teams). Each team will have a protected cross-division rival, who is in the corresponding column, that they will play for the 1st rivalry week in Week 9 (second one is the last game of the season). For the Group of 8 conferences and divisions are the same, but each team plays a 9-game schedule, playing every conference member once, with two out of conference games. The 8 conference championship winners will compete in a tournament for a spot in the Power 8 tournament and a Group of 8 championship. Notre Dame and BYU can only qualify for at-large bids due to no conference affiliation. I feel like this realignment will create new rivalries while retaining the old ones, and it will give every team a chance at competing for a national championship. So here are the conferences.
Power 8
Group of 8
Here is a hypothetical playoff based on the 2019/20 season
Group of 8
Power 8
Last but not least, these are hypothetical schedules for Alabama (P8) on the left and Troy (G8) on the right.