I don't think there's any need to wait until it's been out a while to get this. After all, I do still want to support the developer and encourage Square Enix to keep financing Deus Ex games. I just won't pre-order it, and make sure the reviews are solid and the game isn't broken. But I'll still buy it week 1.

We can protest against the pre-order nonsense without necessarily protesting the game itself - although waiting until the 'all content included' version is the standard price is also a perfectly reasonable approach.