But thrift is just a secondary characteristic. The real quality -- the one that matters -- is a deeper matter of character, and that's what I believe never changes. It varies between individuals, but the percentages stay the same (1:8:1). The cooking conditions change, but the ingredient is always Man. That's why (well, one of the reasons why) "the Greatest Generation" is a crock. TGGers met extraordinary challenges -- their "greatness" insofar as it exists at all is attributable to the test, not the test taker. Drop the Li'l Wayne Generation into the Siege of Stalingrad and you'll have the same amazing stories of perseverance and sacrifice, or, if you don't, that's only because they're soft from years of playing video games instead of milking frozen cows.
If the TGGers had had video games, they'd have been just as lame as Gen X.
The emphasis needs to be on setting the right conditions. The people will take care of themselves, for good or ill. The Spartans didn't know much, but they knew that.
It's valid to compare person x and y who have the same conditions and turn out differently -- that's a character difference. But comparing generations or nations is not valid -- aggregate comparisons are meaningless.