Would it be better if play overuse resulted in plays getting more yellow flags. Eg in the wide open receiver drop he gets called for a push off (thus creating the space). Would result in more catches being made but called back for penalties and force the owners that only run 15 different plays all game into expanding the playbook.
This would also indicate that the defense has made an adjustment to the overused play to draw the foul.
To balance somewhat an overused offense play could be picked up prior to the snap with a timeout, or a defensive offsides.
In saying that no-one wants to see 20 yellow flags in each game. But it would force teams to expand the playbook.