No, it's a tool among many that can be used to fight inequality, not a solution in itself, despite attempts to depicted otherwise by both its supporters and detractors.

> More sustainable solutions would arguably revolve around improving the educational system and revisiting {fiscal, educational, cultural, ...} incentives

This reads like a thinly veiled recommendation to privatize schooling, reduce government supports to make people"hungrier" for success, and leave people's welfare to the conditioned charity of narrow cultural interest groups. Let the "best" rise to the top in the arena of struggle.

Dr King had the best summary of this: socialism for the rich, rugged individualism for the poor.

Incentives working ways that can drag society backwards also. Set up the system so the masses struggle to keep their heads above water, and what you'll likely end up with is a lot of destructive behavior whose cost is borne by society at large.