Whoever takes over doesn't matter....
Last time when Hoya buy Pentax, got a whole load of people making noise and saying DUMP PENTAX IT WILL CLOSE DOWN.
A few years? on, it's doing better than before Hoya took over.
So Ricoh took over... Ok, there might be change, there might not be. It doesn't matter to me. It's not as if I'm going to start panic selling all my Pentax equipment in the fear that Ricoh just shuts Pentax down or changes the whole concept. I very much doubt that the K-mount will die. Whether it will continue pushing Pentax as a value for money system, I do not know. Ricoh has never been a value-for-money option for me... But I already have quite a few lenses (though none of them are particularly expensive); worse come to worse, if Pentax takes a very bad direction I can weather it out until enough lenses are gone (which will be a long time) and pick up older models for a song. No big deal.
Que sera sera, whatever will be will be.