I can understand the Bear’s coach not approving of this rule. The Bears have the most dangerous kickoff return man in the NFL with Devin Hester.
This will not stop #23. In the first place, most of his TD returns come on punts. In the second place, he has been known to take it back from deep in the end zone - and go either all the way or at least well past the 20.
Returns are much more exciting than touchbacks - especially for Bears fans these last 5 seasons...