About new MF lenses: I don't really think there is a need for them. Yes, some might want new ones, but really, I'd rather buy a second hand lens then. Gotta be cheaper (though in Germany old Pentax lenses are quite expensive! Canon lenses are dirt cheap, for obvious reasons, hehe, but Pentax lenses... I think many who buy Pentax do it because they want to use old lenses, so there is a lot of demand). There IS a demand for a 50mm 1.8 with AF... last time I checked someone paid 150 for one on eBay. Canon users would have gotten one for 95 or so, new. :-/ And it's good enough, I've heard that even some 5D Mk II users use these (and it's so cheap that it doesn't hurt if you damage it).
And yeah, when I bought into Pentax lenses were cheaper there, which was one of the things that drew me towards Pentax. Now they are just as expensive or even more expensive than everywhere else, and I don't think that Pentax made losses with the old prices.
Can't they just upgrade their old lenses to AF? All that is needed is something to connect to the AF motor in the body, right?
What I would suggest is an enthusiast DSLR that offers manual controls just like in the past. Embrace the existence of old glasses, base it on the K-5... K-5m or something. Perhaps even add an aperture ring for newer lenses. Hard to explain... basically the camera has to get very thin around the lens mount, so that you can integrate a ring there. Either replace the program dial with an exposure time dial (with A setting of course) or at least add one. And it should look like those classic 70s and 80s cameras. Of course this isn't aimed at professional photographers, but then they are usually going for ff cameras anyway... and those who just enjoy photography might be interested.
Also, may try to make a Pentax video camera? Something for the enthusiasts, again. Lots of manual controls, professional formats, properly cooled sensor. Only Sony are in that market so far, and I don't really understand why. I don't see Canon entering that market... Nikon perhaps, but not Canon. The existence of wonderful old lenses is nice there, add adapters for other lenses, especially those used in cinema. Something of a RED competitor, just cheaper, not as high end.
Ps: My spellchecker in Firefox only knows Canon and Nikon, but thinks Pentax is a mistake. WTF?