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And shortly after all countries would collapse...

To some, that is probably a desired feature, not a bug.

The new rulers?

Feudal lords

What system would be fair and acceptable to you?

A land tax: doesn't violate private property or privacy rights, counter-acts wealth disparity, impossible to evade, and considered the perfect tax by economists due to doing zero harm to economic efficiency.

https://en.wikipedia.org/wiki/Land_value_tax

A miniscule tax on every transaction. Automatically deducted. That's it! No other tax allowed.

By definition, financial transactions are not private, because they necessarily involve a counterparty.