The noise in the 7D reminds me of the classic Panasonic all-in-one super zooms. But yeah, terrible blue channel noise at ISO 100. I'd much rather see them focus on low ISO dynamic range and noise than ISO 64000 jpeg noise. Any addition of megapixels to the 1.6x sensor means I won't be picking one up. 18 is already too many.
Why? More pixels = less noise and more detail.
There is a school of thought, somewhat based in science, that bigger pixels equal less noise and/or higher sensitivity.
There are engineering realities which can nullify, mitigate, or amplify the above however.