As much as I love Dropbox and think Carousel looks nice, I'm finding it difficult to justify in comparison to Google Drive+Docs combo and/or the whole Apple eco

As much as I love Dropbox and think Carousel looks nice, I'm finding it difficult to justify in comparison to Google Drive+Docs combo and/or the whole Apple ecosystem. Dropbox has tough sledding against the level of integration that Google & Apple offer. Carousel isn't going to cut it. I know they bought Mailbox and I think some startups offering nice documentation creation tools, but I'm wondering if they CAN do enough? People say don't worry about the bumbling incumbents, but when it comes to files I'm not so sure. Anyone know how Dropbox is going to win?