Originally Posted by Gruoso 
Makes sense. I was thinking that the Pentax market will change towards SDM in the next 2 years since all the new models will support them and most of the users will have renewed their cameras by then.
I don't think that "most of the users" will change to new bodies within the next 2 years, I know that I won't be doing it. It is too expensive to change DSLR every 2nd year, and I don't feel the need for it. My first SLR was the Pentax P30 bought in 1988, I upgraded to the Pentax MZ-5 in 1996, then to the *ist DS in 2005, and I added the K10D late December 2007. My timeframe is "every fifth year"-perhaps. I am still using my *ist DS and I plan to continue be doing so until it destroys itself and goes "bazook".
I see no reason to sell it just because it comes out new cameras, the image quality of my *ist DS did not change when I bought the K10D - it was still taking good images, and I believe it will be doing so for the next five years to come! I believe I am not the only one that are not planning to buy new DSLR's every 2nd year... If I do, I have no money left for lenses. I rather spend money on lenses than on cameras, because that is a more worthwile upgrade than minor changes in sensor technology (which you can't see anyway if you don't have a good lens!).