Real idea to balance Nid

I think I have a real idea on how to balance nidalee better. It's obvious throwing a spear each 5 seconds is freaking toxic, since you only need to land 1 and the teamfight is pretty much won. So how about this:

What if the cooldown of her spear went to ~20sec IF she misses her spear? It would still be ridiculously strong, though you shouldn't be seeing her throwing spears like a retard in hope of landing one, and if she misses, there would actually be counter play now, since she'd be on a longer cooldown.

What are your thoughts about this? Discuss.