Thrown balls are live off of an opponent’s blocking ball.
All other rules would remain the same (ie thrown balls only have the potential to eliminate one player, team catches stay the same, etc.)
There are many reasons this rule needs to change.
Reffing becomes much easier with this rule. If a player is ever hit with a ball before it hits the ground they are out and traps no longer exist since you can catch with a held ball.
Blocking as a skill becomes more valuable. It takes more concentration to block a ball away from yourself, and other teammates, than it does to just get a piece of the ball.
Speed of the game will be increased. Since a higher skill of blocking is required, more people will will be getting out and games wont be finishing 1-0 like they have been.