sell my hmc150 for a 7d????

[studio1972]

That is exactly the camera I'm thinking of... Scarlet-ish without the RAW codec or the modularity. Frankly, even if it were an attached lens instead of just the mount a lot of folks would be happy.

The problem with a fixed lens is that it would be impossible to have a decent zoom range, combined with a wide aperture (say 2.8) and decent image quality. f/2.8 lenses generally have about 3x zoom which isn't enough if you can't swap the lens. If you start getting into slower lenses (say f/5.6) you end up losing the shallow DoF that is the attraction of the large sensor in the first place.

One other thing. It would be better if such a camera had a lower resolution sensor which didn't use pixel binning to avoid aliasing problems.