It's true, to some degree they should be worried. However, I'm not sure how much they actually have to fear. While I do like the new Continuity features (and I

It's true, to some degree they should be worried. However, I'm not sure how much they actually have to fear. While I do like the new Continuity features (and I'm somewhat of a cloud skeptic), I don't see myself sharing files over iCloud with my friends anytime soon. Another thing that strikes me is, while I do use Dropbox a lot to sync across my devices, and those devices are almost always Macs, I'm also a toxic Dropbox user. Dropbox should not want to keep me as a "customer": I'm on the free plan, totally maxed out storage space by taking part in every conceivable promo, relatively high bandwidth usage, across a lot of devices. There is no possible reason for Dropbox to want me continue using them.