Essentially get a representative sample of the population, pay them and train them up (through neutral 3rd parties), and have the make the ultimate calls.
Just chiming in to say that I concur with your reply here; this article seems to be missing the fundamental point which is, "when/where do experts capable of avid citizenship come from?"
It's worth noting that this can be reduced to, "how can you make the public more well informed and capable of mediating and governing itself?"
If you have those, you have everything! But "getting those" is the whole problem.