Forgot about one more argument:
4) Vertiacal kicks (like bombs) are much more dangerous. Thats why there is a rule of fair-catch in Rugby-union and NFL. This zero-tackle rule would force kickers to use it less.
What do you think about rewarding a zero-tackle to a team if its defensmen performs a clean catch of an air ball (before it touches the field)?
Arguments:
1) This would bring more spectacular catches as well as more spectacular uncatchable kicks. Actually, every possesion would end with...
