I'm not sure what you're talking about as for rifles with integral red dots, but in the case of my M1A SOCOM, I have a Trijicon Tripower on the front rail. It has three power sources, so losing my chevron recticle is unlikely, but even still, I have done drills with the scope powered off and fiberoptics covered. Essentially, you would use it like a large ghost ring - centering the target in the glass and having at it. On man-sized targets it works effectively at making "minute-of-man" hits out to 200-yards. I have since put a LaRue throwlever on my Trijicon and in a pinch, would simply throw the lever and toss the scope into my pocket...
For me, I'm not sure I'd put much faith in a rifle that depended solely on electronics - I'd have to have some kind of BUIS....