All of this is good, but Dropbox is giving months of warning BEFORE they push the new code out. I suspect they will try to work at the block level devices at the partition or LV level, probably attempting to increase sync performance. It wouldn't take much for them to check for any unexpected block devices or commonly encrypted devices, then choose to block them. We won't know until the server-side code changes.
I'd hope for LUKS to work, but I'd also have alternative plans, if it doesn't.
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