Voting, Consent, Dissent

What distinguishes Democracy from other systems is the Consent of the Ruled; in all other cases, Rule is imposed, even if benevolent.  Now, a Vote expresses a double Consent--for a candidate, and for the process. Thus, a vote for a third-party candidate does not adequately express a disenchantment with the process. Nor does not voting, which is tantamount to not resisting being imposed upon.  So, the only medium of potentially effective Dissent would be a None of the Above option in every case, with a range of consequences corresponding to the total of that option defined in advance, e. g. a level that would force a new election, possibly with different candidates.