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Yeah but you can opt to only use encrypted volumes for certain files that don't have to be accessed daily.

You don't take advantage of Dropbox fully, but it's still pretty convenient to be able to sync that small encrypted volume containing tax reports etc.

If it's only a KeePass database or a small (1MB?) TrueCrypt volume for text/documents, the traffic still won't ever become appreciable. Also, you're implying that the only selling point for Dropbox is that it uses deltas, which is far from true.

Actually dropbox and truecrypt work really well together, even with large truecrypt containers because of the way truecrypt updates its container on file changes.