So are you saying that we shouldn't be an honest middle class because we will become poor? How come? what is the logic behind? But I middle class is around 50% of the population in most country so what's wrong with it? There are ways to make a reversal, but I don't think that it will be abrupt though, but being a middle class works, in every country around the world.
It is difficult to interpret what it is in the OP since not much information is given, I think that what he is trying to convey is that there are times during history in which the middle class is crushed due to hyperinflation and they become poor but those that are able to invest in the right assets can become really wealthy really quickly even if they are poor.
And quite honestly there are several examples of that happening through history, one of the most recent examples was the great depression on the US, everyone remembers the desperation and the lack of jobs and money but what no one remembers is that during that time more millionaires were created than at any moment before in history, so if another crisis like it comes then it is possible this could come to happen, however I will admit that you really need to read between the lines to understand what the OP is trying to imply.