Banning the hip drop tackle will be interesting. I'm confused by the 'grip, rotate, and drop' definition though. Maybe I'm misunderstanding but I don't think that definition would cause a flag on the Tony Pollard play, which is what they're supposed to be worried about? That was strictly a grip and drop and more of a slide action the way I'm seeing it. I would actually think a wrap up and rotating technique would actually be the answer to this, having guys tackle through the player but rotating their weight around the ball carrier. That's sort of the approved technique the NFL is using for sacks from the edge now.
The tush push I really don't understand how you would even go about banning it. You'd basically have to eliminate any version of a QB sneak altogether.