Proposed change to Annie's ult

What if Annie's ult behaved like Corki's Q, but with a much larger blast radius and without the visual indicator? It would give counterplay to her ult by allowing enemies to react to it while not completely destroying her teamfight abilities. Plus the increased blast radius might even be an improvement during teamfights. The only problem might be that her ult would travel too slow, which can always be changed if necessary.