USA hockey rejected the change at Bantam according to what they said.
I don't think they need to add a dump and chase penalty anyways.
This is one area where analytics and puck possession analysis at the NHL level has been helpful in showing to coaches that it's better to enter the zone with the puck on your stick than to dump it in, if you want to score goals.
Teams would rather not dump the puck in, but they start doing it in reaction to neutral zone trapping, back check pressure and defenseman standing up at the blue line. If there was a rule forcing you to carry it into the zone, imagine what starts happening when every defender knows that the opponent with the puck has to try and skate through a picket fence of bodies. Kids will get blown up at the blue line by other kids who can channel Scott Stevens and Nick Kronwall with impunity.
Dump and chase needs to be an option, just as throwing pucks to areas where your teammates can skate onto it, or even just chipping it off the boards to yourself needs to be an option. At some point, no matter what you're trying to do to develop skills, hockey stops being hockey if it diverts too far from the version that is played professionally.