April 5, 2021 - Called Walther customer service, regarding PPQ discontinuation. Here's what he said:
"Mainline" is defined as: 9, 40, 45 and NAVY PPQ models with no optic cut and 4", 4.2" or 5" barrels. I did not ask about M1 vs M2, but I'm pretty sure they are both affected. I did not ask about any other model, such as the PPQ-SC, PPS, etc.
The mainline PPQ models will be slowly discontinued in 2021. You should be able to buy one through most of 2021, but they will be ramping down production as the year goes on, so some configurations may become unavailable sooner than others.
PPQ parts should continue to be available for "a good while", he could not define just how long.
Q4 & q5 are not affected, nor is the PPQ M2 .22.
Let's agree the pandemic will continue to affect availability, that was not part of the discussion.
Oh, Walther has heard of people putting the PDP slide on the PPQ grip, but does NOT recommend it.