I frequent both the Walther Forums website and also the PPS Talk website and I would say that you are grossing misrepresenting the situation with the PPS in .40 S&W.
For one thing, you are extremely off-base in your description of when the different calibers of the PPS were introduced. The original 9mm PPS came out in the Spring of 2007. I bought one of them in in February 2008. I later purchased a PPS in .40 S&W in July of 2008 The PPS in .40 S&W began shipping in the USA in the Spring of 2008, roughly one year after the 9mm PPS was in distribution. So the 9mm PPS has been around for just over 4 years, and the .40 PPS has been around for just over 3 years. The .40 caliber model is not at all a new gun. Not by an means.
I've been shooting my fine for a long time now.