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So we have the majors in the traditional dslr market - Canon and Nikon defying gravity to keep their dslr market alive by pretending that EVIL Type camera don't exist, and especially aps-c sensor EVIL type cameras.
Tom it's called "choice"
Even if every camera on the market had an EVF and the OVF was banished it would do little to change the demographics of the camera market. There will be 2 top players and other smaller ones.
A lack of choice is bad for everyone so I would continue to ask for OVF models for DSLR's and if that choice is gone that would be a tragedy for many users.
Tom the world isn't "you must use what I like" that's why things get awful boring. That's why the compact market is a tedious collection of tiresome clones with little attempt to offer something different.
There are lots of mirror less models around now for folks to use if they want to, Samsung, Oly, Pannie, Sony, Nikon and others will join. It would be foolish and stupid to try to make all cameras the same so it's good we have some choice on these mirror less ones too various sensor sizes different systems.
A FF mirror less from Pentax would be a complete flop purely on the basis that these models are aimed firmly at the "pro market" The pro market does not care about mirror less, they are not interested in EVF's even remotely.
A FF proper DSLR might be a good move, but only if Pentax has the resources to support that venture. Most of their lenses are APS-C, they do have some nice oldies that could be brought back or updated but they would need a fairly serious investment in FF lenses not to mention pro support services/rental/loaners/repairts etc and the flashes are outdated too.
It would be no small task. This is why Sony made no impact at all with FF it's sold to some shooters but that model was not what the market wanted (24mp not great low light etc etc)
I don't know what Ricoh have planned I don't see any obvious gaps neither does anyone else but we shall see soon enough. I thought GXR filled a gap/niche but hey what do I know! Anyway we're not even sure if it's a Pentax or a Ricoh thing.
The only possible gap is a DSLR with no mirror (not SLT) if they do that fine no problem, but they'd better offer OVF models or a crazy riot will consume many Pentax users ;-)