Maybe that is what they're thinking, who knows, but Fender haven't stopped making Strats and Gibson haven't stopped making Les Pauls (apart from 1960-68, before someone plays smartarse :P )
Fender and Gibson have a steady stream of buyers. Young kids today know who Slash or Jimi Hendrix are, and what guitar they played. There's always demand for a 'classic' electric guitar from the fans of the legends who played them.
PRS don't have that heritage to play on, so they can't just churn out Custom 22s forever.
They've got 25 years' heritage, which is a long way short of Fender and Gibson, but still isn't bad. It's true they don't have any iconic players associated with their instruments (except Carlos Santana).
But they've been extremely successful. Gibson felt threatened enough to launch that lawsuit over the Singlecut. I'm not convinced that there's a limitless stream of buyers for Fender/Gibson but demand for a CU22 has just peaked or dried up - yes, it's on a smaller scale, but there are always new customers out there.
I'm probably completely wrong, but I still think it's odd to celebrate your 25th Anniversary by dumping a lot of established models and issuing
new ones. You'd think they'd be trading on their heritage rather than - seemingly - rejecting it. It smacks of desperation to me. I wonder if they've overstretched themselves by chasing the big boys and they're going to slip back down into the pool with the likes of Hamer, Music Man, Suhr and Anderson?
(I know I sound like John Laurie off Dad's Army going "We're all doomed". I'm a glass-half-empty man.

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