I think you are looking at the petition from a different point of view. When ESL started petitioning up to 7A, it was to maintain the class that they had competed in since the 8 class system was put in place. At the time, this board crucified ESL and called the coaches arrogant for not wanting to play 6A. The petition wasn't used to avoid a specific team nor create a favorable lane for a championship. In '13 and '14 ESL had two of their worse teams in recent memory and made it to the semi's and Qtr's with a 6-3/ 5-4 regular season record. I am sure LA felt the same way after competing in 8A for all those years. If the conference was ESL would pretty much stay 7A for ever.
On the other hand, I can see some teams opting to move higher to avoid certain teams in the playoffs. So far that trend hasn't started yet but we will see what the future holds.