A hard fork could be used to make curation harder to game. For example, if curation was on a flat curve, there would be no point to auto vote unless one is lazy. The curve could just be made flatter, especially if the post doesn't zoom to the stratosphere and actually trend. Alternatively, a random feature could be thrown in.
Or we could just ask the autovote apps to skip the post if the tag #noautovote is used. They could enable this by default, but allow curators to disable if desired.
This comment could also be added in front ends by default at the end of a post and comment as a hidden comment [//]:#noautovote. It would be good to allow the user an option to remove it, but this could be notified in some indicator to prevent farming.