This relationship between camera owners, the number of lenses they own, the lens mount, and the manufacturers is an interesting one. The lens mount is both a liabiity and an asset at one time. An asset because customers may continue to buy lenses, but a liability because at some point, it prevents the manufacturer from adopting newer technologies that may require a mount design change. So you find a company like Sony not only building bodies for their new mounts, E and FE, but still building a body for the older A-mount lenses.
One thing Pentax could do is come out with a sequel to the K01. The K01 has sort of a cult following now. Call it the K02 and add enthusiast features like a shutter cable port, add a built-in EVF, add a tilting LCD like the 645Z - there's plenty of room for that, add built-in wifi and remote operability to a smart phone, improve the existing focus peaking and focusing magnification feature, improve the HDR range to what they provide on Pentax DSLRs, and you'd have a counter-culture mirrorless camera that would sell like hotcakes. Plus it would AF all the Pentax lenses and MF like a fox.
One advantage the K02 would have over other mirrorless, is that it has a better build. Sony's Nex style cameras have a weak tripod mount - i've seen a post where the tripod mount twisted out. A WR K02 would have a durability factor useful for travel and hiking. Its not too late for Pentax to revamp the K02. Frankly, i would thow out the Marc Newsome signature on the bottom
I think the K02 as described would sell well, especially if it had a FF sensor. Even if it didn't sell well, the upside would be they would have the mirrorless technology all developed for future cameras.