It would be nice to see the next generation of cameras with 3G/4G built in, but only if there were data plans that let you share among multiple devices (e.g. $60 for 5GB/mo to split between a camera, MiFi, Kindle, etc).
It might be better to keep cameras as a separate package.
I'm far from an expert on photography but afaik -- physics imply that there are constraints on getting good images because of sensor size (especially in low light conditions; number of photons per cell/second).