I think pretty soon the megapixel discussion will move from reality to theory. For example, my computer has 12GB of physical RAM, but Apple tells me that its OS can theoretically handle 64 terabytes of RAM. I envision a day when the guy at the local camera store, if they still exist, will say,"the top of the line Canon has a 120megapixel sensor, but a theoretical 15,000 megapixels could be captured." Just in case you wanted a print the size of a 10 story building.
Seriously, though, it's already been done with ISO. My Canon has a native ISO of up to 6000 or so, expandable ISO of 102,500. How on earth can that be useful, other an taking a photo of noise?
When imagining a world of limitless megapixels, consider that by current standards, a 120MP image will consume 200-300MB. That means you get fewer than 20 shots on a 4 GB card. And aside from a super crop, or a really, really big print, it has few practical applications.
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