“Dearth” was a bit exaggeratory. But I can rattle off a considerable number of sires who should still be around today who left large holes in the mid-range market that don’t feel like they were ever filled by anyone equivalent. (Harlan’s Holiday, Bernstein, Dixie Union, et. al.)
But I’m sure that perception is just from the polarization you note. Those boys may have been standing for $100K or cast off to wherever by this point.
This has zero to do with Zenyatta, so moot point.