The nice thing about this DAC is that it is scalable and it doesn't need a lot of big players to be sustainable. Governments will surely avoid this DAC in the long run as it is not regulated by them and not created by their unefficient bunch of civil servants. But private organizations and NGOs will definitely see the benefits of having a simple and efficient DAC to run their voting process. They just need to know about it and how easy it is to use.
I think the big thing here is the DAC will have to provide an easily understandable user interface and a comprehensive "user's manual", so that any non-developper guy can set it up and get it running for their organization.
The big paradigm shift won't be for non-technical people to understand the basic principle of "one verified profile, one vote", but rather to understand that it cannot be tampered with because of the blockchain technology.
I guess the biggest issue will be there... Making sure people understand it's as safe as any other voting method (and probably much safer), while much easier to deploy and use. Marketing will be the key, as with all the other DACs that imposes a paradigm shift.