This is actually good.
Everyone here will likely shoot me for saying that, but this is the best thing that could happen to Zed balance-wise right now. Why?
**Because now this argument no longer exists to justify his laning phase**: "Buy Mercurial and Zed's useless."
In other words, this is one less anchor for the balance team to have to deal with when trying to figure out how to fix Zed, so his normal ability numbers can be hit without having to worry about him being utterly worthless come mid- to late-game.