Actually, the direction I see happening in the "reinvention" category is to lose the "SLR" part altogether, which I am certain will happen in the not too distant future.
Let's remember the very reason for the SLR mirror-pentaprism optical circus was to enable the photographer to see exactly what the film (and now sensor) "sees" - no parallax error as with TLRs, more convenient than the view camera concept. Notwithstanding the fact that most DSLRs do not show 100% of the image anyway, I think the future will hold some very different approaches of which we are just beginning to see signs.
Look at the micro-four-thirds stuff Panasonic and Oly are making now - the big deal there is that without the need for retrofocus lenses (since the mirror box no longer exists, so there is no requirement for that 42MM space in front of the chip) the lenses are much smaller and lighter. I compare my 12MM Voightlander lens (used on my 35MM Bessa) to the 12-24MM Sigma zoom or the 14MM Nikkor and the former is maybe 10-20% the size.
Today's LCD screens are still not of a high enough resolution to display the equivalent of a reflected image from the lens to the eye, but that will change. Imagine an LCD with, say, 300 PPI resolution, where you will be able to see the quality of the bokeh in the background and note the DOF at f11 or whatever. When LCD (or OLED or whatever display technology moves along) gets to that level of quality, you eliminate the need for the relatively deep mirror box.
Note that Panasonic offers pro videographers a 2 piece video camera today - there is a small box with a lends mount and an imaging chip inside, and that is tethered to a video display with the camera controls. It is designed for quasi-remote use - stick the camera on the dash in front of the driver just under the top of the steering wheel and we get to see Brad or George or Angelina tear down the street from the "steering-wheel-point-of-view". But the point is that this will only become more common as technology marches on.
Furthermore, I have been seeing occasional articles about work being done on creating spherical rather than planar imaging sensors, and this too will make for some major changes. Historically, lenses have to be made with appropriate correction for the fact that the distance from the focal point in the lens to the film or chip differs from the center to the edge of the field of view. Think of that 12MM lens I mentioned - the 12MM connotes the distance from the "crossover point" of light rays inside the lens to the center of the film plane behind it. However, the distance from that same point to the corner of the film is more like 14-15MM. The lens' design incorporates corrections that would not be necessary if the image device were a concave view of a portion of a sphere.
So, again, I think we are all about to see some very big changes coming along, no doubt as radically different from what we know as a DSLR would have been to Matthew Brady.
I'm just sayin'.