As long as this card is in play, all dragon balls in play or brought into play lose their powers for the rest of the game; even if this card is discarded.
You've already made some pretty big assumptions about me, and that's a mistake.
Errata:
This Drill affects all players. When a Dragon Ball is placed into play while this Drill is in play, the Dragon Ball is considered to have a Blank Text box until it leaves play or until the end of the game (whichever happens first), regardless if No, Really Drill? leaves play
later on in the game.
Example: Player A has No, Really Drill? in play. Player B places Earth Dragon Ball 3 into play. He
cannot use Earth Dragon Ball 3’s power because it is a blank text box. Later on in the game No,
Really Drill? is discarded from play. Earth Dragon Ball 3 still has a blank text box while No, Really Drill? is not in play.