I have to agree with skieur.
Sony was pretty early in the digital camera market, and actually had many mid-level fixed lens units throughout the early 2000's. However, they lacked the infrastructure to offer a DSLR until the minolta aquisition.
I get tired of this kind of attitude people have reagarding Sony camera equipment. The cameras are cheaper then most on the market and have the same sensors as other brands. The glass offered is great quality and to par with most other brands. I think its about time that Fan boys figure out what Nikon, Zeiss and hasselblad already have.
It has been very clear though that Sony is not interested in the professional market. But I am not sure what this has to do with everyone else. I can think of only one or two people here who actually shoot a "no question about it pro level body", or ever would. For the rest of us Sony is an option that can be considered. Sony cameras reflect what sony has always excelled at: consumer goods.
Sony certainly COULD make a pro-level camera, and they do sell a lot of pro-level video equipment, and some might say that the a900 was there, though I am not sure it really compared to a D4 or 1D. Sony's cinema cameras also seem to be pretty well received, so I don't think it's a matter of Sony's abilities to produce "pro level" gear, but rather the photographic market's willingness to accept it.