The point about the two-tier society is that when people are excluded and cheated their is always a possibility that their perfectly justifiable anger can be diverted and exploited by demagogues who have objectives completely at variance with their interests.

It's not a new phonemenon, it's happened time and time again. And it's happening now.
The way a democracy can counter this is to always ensure that oeople have the chance to change their minds if they wish to and correct their mistakes.