As long as they print a hand trap that negates a banish effect I could see half the banlist coming out. A lot of these cards are powerful but the really problematic ones just have little answers and the answers they do have aren't assessable to every deck. Maybe a hand trap that negates a banish effect but cant be activated in the opponents turn if you have a card banish would be a good way to give some cards a counter without printing a broken card that would rival Ash in effectiveness.

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Hate hand traps but at this point with the abundance of them, it really is the easiest way to fix the game. Look at NIB, card is stupid strong but the game has changed for the better because of it. Now there is a mind game to throwing up your hand on the board.