My guess would be expand the 14 would be 7 teams in each conference with the #1 seeds getting a first round bye
1st round - 2 vs 7, 3 vs 6, and 4 vs 5.
Then in the second round the #1 seed would play the lowest seed remaining from round 1, while the other two teams play each other.
If it expands to 16 teams, that's 8 teams each conference, so no byes just 8 teams lineup in single elimination for both conferences
14 Teams for the playoffs would be perfect. Only one team gets to fight for the bye week during the regular season and one more team gets added to the wild card.