There's a HUGE market at the $3,000 price point among videographers and student filmmakers. You can buy a couple lenses and have a usable kit under $4,000 or you can spend significantly more and develop something that's almost production-ready for music videos and shorts or as a b camera for a serious rig. Canon would be foolish not to introduce an EF mount cinema camera in this price range, but for whatever reason it seems they want to start with expensive products and work their way down...
1080p/60fps would be nice, but is trivial compared with a reduction in aliasing and skew and a boost in actual resolution.
for the same reasons all other film-product competitors don't have equipment that cheap. Sony does have the fs100, which is at $5k, and you can now get canon/nikon mounts for it.. but there are still substantial limitations. The benefit though, even over the f3, is that you get 60fps@1080p.. the downside is the bitrate and color space, and only hdmi out, as well as the form factor and build quality. Enough people already complain about the fs100 in the professional video field.
You also have to remember.. sure, there is a huge market base for$ 3-4k as you say.. but there is an even BIGGER market base for $1-2k, or $300-500 - what's to stop them at 3-4grand if sheer volume of market sales was their intentions? I, for one, would love to save up for the c300 of f3, as the Arri Alexa is out of my price range.. and i'm simply happy and fortunate to have a professional option for less than 20 grand.. something that could provide me with a return income that costs about what a new Honda costs.