Dan I understand what your saying as far as price goes, but it all depends on what you want to do in photography. I like to hunt so I like to find any reason I can to stay in the woods before and after the seasons open or close. Its hard to take wildlife pictures of any satisfaction with a single fixed lens camera. I wanted the versatility of carring several lens and being able to change lens from opportunity to opportunity, plus to be able to change aperture size and speeds quickly to capture different shots, not just knife pictures. Hard to pull in an A-10 flying 600+ with any satisfaction with a fixed lens. My auto focus 300mm lens does a pretty good job but still I wish I had a 1.4 converter and possible a 600mm lens. But it all comes down to what you want to get into besides knife photography.
As for the obselete thing, everything you buy has a new and better version either on the drawing board or already in production when you buy what you just bought, so I don't worry about whats coming out next week or next year, I try to buy what I think will do what I want done. Sure my D50 might be replaced with a newer version next year but this camera will give me years of use and once I decide to upgrade again if I do, I'll stay with a camera that will still accept the lenses I have. The camera isn't the expensive part, it's the prices of good low light quality lenses that can add up super quickly.
I just said, think carefully, for it is cheaper in the long run to buy a $600 camera first,then to buy a $300 one and then upgrade to the $600 in a year or 2 because you want to expand your photography abilities. That $300 will buy a good used quality lens, or help anyway.
Have fun
Bill