Kids play with current balloons because they’re elastic and bouncy. I think they would be bored of a perfect sphere that just hovers around the room. Further,

Kids play with current balloons because they’re elastic and bouncy. I think they would be bored of a perfect sphere that just hovers around the room. Further, given that the vacuum balloons are rigid, I think it’s far more likely to take on a leak that fills the balloon rather quickly but not instantly. For argument’s sake, suppose one does fail suddenly- do we even know what that sounds like? I don’t think it could possibly be worse than a (thick enough) mylar balloon pumped up to two atmospheres and exploding. It’s not like suddenly there’s vacuum in the room.