Time for two steps back. Look both ways. Hhhmmm. Let's forget everything we know other than the K3II has been discontinued. Hop on over to B&H and drill down to Pentax and sort by "best sellers". The K3II is by far and away the top with mostly K-1 and some K70 mixed in right behind it. You're to the bottom half of the list before you start seeing the KP in any quantity.
It's been a long time since I sat in my econ classes, but seems to me, barring a problem in the supply chain, the longer you make a particular widget, the cheaper it becomes to make, and in turn unit costs go down and profits up. There's a plateau to all this, and it levels out. Overt time, these are often referred to as the "cash cows" in a company. Good solid stable sources of income. You're not blowing out the margins, but you're keeping lights on and other stuff flowing. Good to have. Seems to me, barring a problem with sources, the K3II stands to be a cash cow pulling in some constant income. Seems like camera companies need that, badly.
Why would you just pull the plug on keeping this all humming along if you didn't have something pretty imminent?