Dunno, I think the good in 60s might be spot on considering that was the last time we won anything.
You have to be lucky to be successful at international football, to get a good first eleven is not like club football, you could be undone by having a generation with class attacking players but very poor defenders or vice versa and no transfer market to do anything about it.
We will never be a dominant nation but it might all come together one time and we get to party and talk about it all the time to wind the bitter little celts we have to share this island with.