In Zeev's Honor, Plan the Trade and Trade the Plan

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"Middle class" or any class is not a living being. Human beings live as individuals. Social mobility is crucial in discovering individual talent, and in allocating limited resources to individual good ideas. You may not think much of the electronic cigarette (me either, frankly, as I do not smoke), but the millions of people who buy it think it's the best thing since sliced bread, and it certainly helps them getting over the fix without exposing themselves to the myriads of detriments of real smoking.

Without social mobility and new ideas bringing on unexpected productivity increase and unexpected improvement in living standards, economic rent seeking would take over the society and make it into a hellish place like many parts of the world.