I watched the Steam top sellers list on and off for Rage's status there after release. It started slipping fairly quick. Maybe it did better on consoles, but it certainly doesn't seem to have turned into any sort of popular phenomenon.
The most ridiculous aspect to Rage wasn't the game itself, but the astonishing communication fuck up between id and AMD. Clearly they had assumed AMD was on top of things and not months behind schedule with their OpenGL driver.