re: Is it time to set aside the "once in a generation" tag for players?

Maybe people mean once in a generation players for that particular school. That moniker works when you put it in that context.

Cam - once in a generation for AU
Tebow - once in a generation for Florida
Johnny - once in a generation for TAMU

all of those players stand as the best player/most accomplished at their school over the past 20-25 years (generation).