I know, but it would be so beautiful if they did manage it, wouldn't it? It probably can't be done as the main plot of the season, but as a running B plot maybe? Simplified, so probably mostly consisting of Korra running into situations in which benders are oppressing non-benders and she realises that her job is partially to protect the latter, and maybe culminating with something like the election of non-bender representatives to the council? All this policing of non-benders en masse with Tarrlok seems like it's sort of going there, though admittedly the writers will probably want to wrap it up by the end of the season and that leaves them without a definite villain, which they do seem to want.

Oh! Actually, what would be really cool would be if after Korra&co. defeat Amon and the secret violent bits of the Equalists and are trying to deal with replacing Tarrlok on the council, the Equalists show up as a legitimate political party and the plot could be something like Korra realising that that's the side she should be on, now that they've given up violence. That gives you a narrative simple enough for kids, admittedly lacking a really obvious villain, but with enough going on and enough possibilities for minor antagonists that it might work. (I don't think this will happen, mind, but it would be interesting!)