Things don't necessarily progress indefinitely, they can also regress.
Take away the free public schools and illiteracy rates will surge and we'll be not that far off from the poverty rates before free public schooling began. Sometimes maintaining something is an achievement in itself.
I'm not talking about taking then away. I'm saying they aren't doing a very good job, especially in some locations and in some subjects. Are they better than nothing? Sure. It would be pretty sad if this is the best we could possibly expect though.
Take away the free public schools and illiteracy rates will surge and we'll be not that far off from the poverty rates before free public schooling began. Sometimes maintaining something is an achievement in itself.