I would consider an ideal society something that falls between our evolutionary bounds. Since all organisms do best within a certain range of conditions, it's fair to assume the same with humans.
Thousands of years is a heartbeat in the larger timescale. And just because it's been around for thousands of years, doesn't make it right.
If a change is wrong, we will know, and we will fix it. But to just sit back and say everything's ok when we have all the problems in the world just isn't...well, ok.