I believe this was a quid pro quo move by the IFCA and IHSAA (I could be wrong, just my optics on the situation). State wanted mercy rule, coaches wanted six quarters. Came to an agreement. Quality work by both sides.
6 quarters will indeed be huge in development of better football players, i.e. more in game reps, etc. Sometimes teams have a few tweeners that could help on Friday nights, but still need work in J.V. This alleviates having to choose or worry about it.
Better football is the result, if done correctly.