I think you're on the right track, but it's a bit more complicated than just 'moving to github'.

For example, majority voting isn't always the best solution to every problem. Should court cases be decided like a reddit link where most people don't read the content, or the highest comment is a stupid pun?

I have no doubt that our institutions need to be updated and/or replaced, but it will likely have to be done piecemeal to minimize negative disruptions.

There are a lot of (technical) problems that will need to be solved to support such a system.

Don't forget that you'll need to convince everyone else in the country to switch to the new system.