Often many rules changes, including the discussion of widening of the field, begin at the NFL level and filter down.
I doubt the field will be widened anyway for both the high school and college games, and such a move is unnecessary for that matter at that level of play.
NFL play is a whole other dimension in American football!
Also most NFL stadia are big enough to allow for a wider field because those that were built since the 1990s were built to allow for also a soccer field with removal and re-positioning of seats.
Also there would be a phase-in period for older NFL stadia though still with wider fields as the dimensions would permit.