Erich Ocean
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I am not sure you are right if you also consider the cost of sensor development and all the boards and firmware to coordinate with it.
Well, as someone who has his own custom hardware/firmware camera (with a 4MP global shutter sensor @ 120 fps) and is now upgrading said hardware to a newer sensor (12.2MP global shutter @ 120fps) with the same board design, I can say a few things about this.
1. You can reuse a lot with a new sensor, but if the data rate changes out of spec for the board, there will be a redesign of the board. (One way to mitigate this is to reduce the data rate immediately after pulling off the sensor, if you actually don't need the extra resolution.)
2. Redesigning a working board is not a particularly scary thing to do, but it's also not instantaneous. It's much, MUCH easier than designing the original board from scratch.
3. Actually hooking the new sensor to an existing board design is not hard.