Moving to Google Docs would be a big step backwards in functionality. Word + Dropbox is perfect because it combines cloud availability with native capability.

If you want me to switch, you need to offer something better. The ability to handle the organization of large documents would be a great start. I'd love something with the features of http://www.bartastechnologies.com/products/copywrite/ would be awesome. CopyWrite is only for Mac and I don't want to switch OSes just for a word processor . . .