The thing with voting is that it really isn't a heavy cost, so you would expect a lower exploit rate than traditional media. So while still soft-consensus, there is a mechanism in place that could encourage better behavior while requiring some "effort" to exploit.

There would be some mechanisms that you would have to play around with that either requires a hardfork or and third party facilitator in order to implement properly and smoothly, but as you mentioned, the underlying encryption ideas are there to borrow from.