Originally posted by rawr Ricoh seem blind (or indifferent) to this real and present danger.
It's been a danger forever. People have always left Pentax to buy an FF from another manufacturer, but at the same time people continue to buy into the Pentax system, getting K-S2s, K3s etc. In half a year some people will have left and got something else, and some people who are currently working with APS-C cameras will be ready to make the jump to the new FF.
There isn't a fixed number of Pentax users who will buy a FF that constantly decreases, rather it's a pool with an outflow (people leaving for other systems) and an inflow (people buying into the Pentax system).