A technologically augmented (neo)liberal society that owns most of the wealth, including most of the neo-feudal labour and resources, would only need to be the size of a small tribe - less than a thousand, more than a hundred people - to be stable and self-sustaining.

If there's an "obviously" here, it's that this is the direction in which current trends are heading.

The peasant class can reproduce all it wants. Managed Malthusian resource limitations will keep it from being a political or - eventually - even an ecological threat.