I seldom see Semillon from California where I live, but I have been told
that California Semillon was more popular in the era shortly after WWII.
I believe Wente made quite a bit of Semillon from Livermore-grown grapes
in those days that was distributed throughout the US. But Semillon does
have the potential for making long-lived wines in the right regions,
especially when made in a late harvest style. After all, Semillon is the
major grape used for Yquem. I also have read that, in the old days, some
Australian Semillon was called Riesling. Unfortunately I do not see many
of the better Australian Semillons in my area.

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