If the CCD is what picks up the light from the lens, then couldn’t you just take a CCD from a still camera, which is usually much better quality, and put it in your camcorder?
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The imaging chip is only part of the system. The lenses, firmware in the electronics, storage media, mics, location of the controls, and lots of other design works together to provide the package.
Just replacing the imaging chip – whether CCD or CMOS may have some marginal improvement. But increasing the lens size along with a larger CCD will have a huge impact… By merely replacing a single part, the "weak link" just moves somewhere else.
For example, a car is a system – replacing the motor with a bigger one could make it go faster. But if the rest of the car is not designed to handle that additional horsepower, the rest of the parts will get thrashed, cornering will be bad, the tires won’t last as long and the mileage will be terrible.
Your statement makes sense, but does not take the longer view of the different parts working together for optimum balance between the different capabilities of the different parts that make up the whole system. In this case, a too-large imaging chip would be a waste if the lens system was too small to let enough light in that the chip could use.