I have been around long enough to see some rejected ideas come back (under a different name of course) to be lauded most loudly by those who rejected them most loudly a couple of decades previously.
I don't know about other countries, but in education in England there appears to be a pretty direct correlation between one's ability to bandy about the latest buzzwords a week before anybody else has heard of them, and one's career progress.
ps. That last sentence is not just sour grapes from a noble teacher who refused to play such hypocritical games and suffered as a result. I played along for a few years - and reaped the rewards .