I think the essense of the problem is not the fact that everyone's opinion counts equally, which it does in democracy, but the way that those opinions are being informed. That's what's changing for the worse.
First of all nearly all social media now is guiding people towards opinions in line with their own. It's a technically beautiful idea, but the more successful the technology, the worse for democracy.
Slashdotters at Google, Facebook, even Amazon, everywhere else directing eyes: do you see how you're seriously subverting and polarizing our democracy. As a media organization you need to take responsibility for making sure you are not hiding alternative viewpoints. By doing this you're squeezing out the center, both in terms of how voters identify themselves and discuss issues, and in terms of politicians' loyalties.
The incredible shrinking center
And there's also the continued bite-sized-ification that prevents construction of thought-out arguments. This has been progressing for a long time, but keeps getting worse.
In both cases, we need to compare to what we had when the technology for communication was largely print and newspapers, and think about how to replace what's been eroded away.