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Developmental costs would be pretty high. Digic processors are only setup to handle one sensor. Balancing color and brightness between sensors, combining images, synchronizing them, and getting rid of 4X the heat would probably push the cost out of sight, and even then, a large sensor would likely outperform the combination.
I'd never buy one over a single sensor, too many compromises that are not necessary. For a multimillion dollar aerospace uses where a multi million dollar supercomputer reassembles the images over a period of days with a staff of scientists to manage it is one thing, a consumer camera is another.
The Gaia spacecraft will use 106 CCD sensors to survey the stars and will have a combined resolution of about 938MP.
http://en.wikipedia.org/wiki/Gaia_%28spacecraft%29
How do you know this? I work in the semiconductor test industry, and while I don't know for sure I believe that cost of producing larger IC's goes up way faster than producing more smaller.Sure they do, they have lower yields, but unlike a PC motherboard for example you have the additional cost of trying to precisely match and align things. Not to mention anyone can buy say an ARM processor for under $10, but you won't see an ARM core systems on the top 500 supercomputer list.
At some point / volume it makes sense to put everything on one piece of silicon, unless you're at the cutting edge when you need a 1000 image sensors or CPUs for your cutting edge design.
Link seems to be broken, but do you think 4 smaller sensors would be significantly cheaper than a 35mm sensor?
Technically it may be a little cheaper for the sensors themselves, production costs and yields tend to go up a fair degree with increasing die size, however that would be offset by increased costs of the sensor read electronics and assembly costs. I'd also assume they'd be a gap between sensors which might not matter for that sort of application because maybe they always interpolate multiple frames. I suspect in that particular case it makes sense because they are dealing with a size well beyond any practical manufacturing techniques for making it on a single die.
You can learn a ton from SLRlounge's excellent Lightroom series (117 videos and counting). Awesome video's and extremely informative.Thanks for that one! I just checked it out and watched the first 10 little videos. Very comprehensive.
http://www.youtube.com/playlist?list=PLA9A4D4A585B92249&feature=plcp