Why would any "self-respecting" Democrap or Republican't vote in favor of adding NOTA to the ballot? Why would they be in favor of ANYTHING that would weaken their duopoly control of the economy and society?
Americans have been "voting" for NOTA in increasing numbers, by not voting at all. The US has some of the lowest voter turnout rates of any large democratic country.
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Full report here: http://www.pewresearch.org/fact-tank/2016/08/02/u-s-voter-turnout-trails-most-developed-countries/
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"Just my 7 cents (2 cents after taxes and inflation)."
If the people demand it, seriously demand it, then it will be instituted. We have created and revoked amendments to the constitution. I agree it would not be easy, but Dang It, I think it should happen. I believe candidates would be better vetted and less games would go on after the primaries if they knew they could still be dropped. It would become a contest of finding and being the best candidate, rather than just mud slinging to make your opponent look worse than you. Is that really how we want to choose our leader?