JimC......It's a matter of definition. As to a standard your definition must differ from mine.
As an example:
My Honda bought new in the 90s came with a cassette player as standard.
In addition, my wifes one year old Cadillac came with both a cassette and CD player, therefore the CD is not necessarily the standard as I perceive it.
You state that CD sales exceeded LP sales in 1988, however cassette sales exceeded LP in the early to mid 80s and was the preferred product prior to the CD. I believe the cassette was successfully marketed after the LP and prior to the CD.
Just a couple points of debate. I didn't say it took twenty years as you imply, I stated it took "almost twenty years", and next you use the term established which differs greatly from the term standard.
Remember, the original subject centered around short term industry forecasting and my opinion concerning their follow up on actual sales and their performance level.
Concentrate your efforts on the target, not the fringes.